diff --git a/app/assets/javascripts/application.js.erb b/app/assets/javascripts/application.js.erb
index 9a57371f..71c2dde1 100644
--- a/app/assets/javascripts/application.js.erb
+++ b/app/assets/javascripts/application.js.erb
@@ -381,6 +381,10 @@ jQuery(function ($) {
     } else {
       custom_base_layer.addTo(map);
     }
+    if ( $('#selection').data('map-marker-display-mode') === 'zigzag cluster, w/gradient' ) {
+      $('#map').addClass('gradient-icons')
+    }
+  
 
   } else {
     console.log("No custom base layer defined");
diff --git a/app/assets/javascripts/graphics/clusters.js b/app/assets/javascripts/graphics/clusters.js
new file mode 100644
index 00000000..7ca522cb
--- /dev/null
+++ b/app/assets/javascripts/graphics/clusters.js
@@ -0,0 +1,7 @@
+var cluster_small = '<svg data-name="cluster-small" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 297.52 297.52"><g id="path846" class="cls-3"><path style="fill: rgba(255, 0, 153, 0.8)" class="cls-2" d="M148.76,5.03c24.31,0,42.1,25.16,61.73,36.52,20.25,11.72,50.81,14.94,62.52,35.2,11.36,19.63-.8,47.43-.8,71.75s12.15,52.11.8,71.75c-11.72,20.25-42.27,23.48-62.52,35.2-19.63,11.36-37.42,36.52-61.73,36.52s-42.1-25.16-61.73-36.52-50.81-14.94-62.52-35.2c-11.36-19.63.8-47.43.8-71.75s-12.15-52.11-.8-71.75c11.72-20.25,42.27-23.48,62.52-35.2,19.63-11.36,37.42-36.52,61.73-36.52Z"/><path class="cls-1" d="M148.76,5c23.92.53,39.39,21.8,57.89,34,3.78,2.55,7.83,4.65,11.99,6.5,24.14,10.65,58.19,15.91,59.35,48.62.85,18.34-5.47,36.1-5.47,54.37.05,18.28,6.41,36.01,5.61,54.38-.75,21.32-15.63,31.71-33.89,38.93-12.61,5.22-25.97,8.83-37.38,16.49-11.33,7.7-20.85,17.68-32.33,25.26-7.62,5.08-16.46,8.98-25.77,8.97-9.31,0-18.15-3.88-25.77-8.97-11.48-7.59-21-17.57-32.33-25.26-11.41-7.66-24.77-11.27-37.38-16.49-18.21-7.2-33.15-17.59-33.89-38.93-.8-18.37,5.55-36.1,5.61-54.38,0-18.27-6.32-36.03-5.47-54.37,1.17-32.71,35.19-37.96,59.35-48.62,8.43-3.56,15.89-8.92,22.88-14.76,13.79-11.19,28.09-25.56,47.01-25.74h0ZM148.76,5.06c-23.91.57-39.33,21.84-57.81,34.07-3.78,2.56-7.84,4.67-12.01,6.53-24.02,10.65-58.03,15.91-59.14,48.48-.82,18.32,5.52,36.07,5.55,54.35-.03,18.28-6.36,36.04-5.54,54.35.77,21.15,15.55,31.36,33.66,38.5,12.6,5.19,26.06,8.82,37.5,16.49,11.34,7.68,20.92,17.68,32.36,25.22,7.54,5.02,16.24,8.85,25.44,8.84,9.2,0,17.89-3.81,25.44-8.84,11.44-7.54,21.02-17.54,32.36-25.22,11.43-7.67,24.89-11.3,37.5-16.49,18.06-7.12,32.9-17.34,33.66-38.5.82-18.32-5.51-36.07-5.54-54.35.03-18.29,6.37-36.04,5.55-54.35-1.12-32.57-35.11-37.82-59.14-48.48-4.17-1.86-8.23-3.98-12.01-6.53-18.47-12.23-33.9-33.5-57.81-34.07h0Z"/></g></svg>';
+
+var cluster_medium = '<svg data-name="cluster-medium" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 297.52 297.52"><g id="path846" class="cls-3"><path style="fill: rgba(255, 0, 153, 0.8)" class="cls-2" d="M148.76,5.03c14.4,0,25.17,21.79,38.16,26.01s34.96-6.77,46.17,1.39,7.32,32.18,15.56,43.5,32.21,14.76,36.58,28.22c4.22,12.99-13.01,29.94-13.01,44.34s17.23,31.35,13.01,44.34-28.42,17.02-36.58,28.22-4.24,35.26-15.56,43.5c-11.21,8.16-32.7-2.99-46.17,1.38-12.99,4.22-23.77,26.01-38.16,26.01s-25.17-21.79-38.16-26.01c-13.46-4.37-34.96,6.77-46.17-1.39-11.32-8.24-7.32-32.18-15.56-43.5s-32.21-14.76-36.58-28.22,13.01-29.94,13.01-44.34-17.23-31.35-13.01-44.34,28.42-17.02,36.58-28.22,4.24-35.26,15.56-43.5c11.21-8.16,32.7,2.99,46.17-1.38s23.77-26.01,38.16-26.01Z"/><path class="cls-1" d="M148.76,5c10.21.4,17.12,9.28,24.03,15.72,3.51,3.38,7.1,6.84,11.46,9.1,4.37,2.31,9.49,2.39,14.32,2.01,7.32-.59,14.54-2.37,21.9-2.59,16.23-.82,19.62,10.67,21.82,24.27,1.74,9.3,2.4,20.32,10.62,26.44,9.47,7.59,22.85,10.2,30.54,20.13,7.56,10.8-2.83,24.26-7.08,34.45-5.04,10.67-5,17.28.03,27.89,5.93,13.19,17.67,28.53,1.89,39.79-7.96,5.93-17.57,8.97-25.25,14.96-1.9,1.5-3.58,3.26-4.83,5.3-6.72,11.85-3.87,26.95-11.19,38.61-3.51,5.53-10.36,7.31-16.56,6.99-7.37-.2-14.63-1.97-21.93-2.54-4.81-.37-9.83-.26-14.08,2-2.13,1.1-4.09,2.53-5.95,4.09-8.93,7.14-17.38,20.45-29.74,20.87-10.36-.39-17.4-9.39-24.36-15.92-3.47-3.36-7.03-6.8-11.32-9.04-4.25-2.25-9.28-2.36-14.09-2-7.3.57-14.55,2.34-21.93,2.54-6.18.31-13.05-1.44-16.55-6.99-7.31-11.66-4.47-26.76-11.19-38.61-1.25-2.04-2.93-3.8-4.83-5.3-7.68-6-17.3-9.03-25.25-14.96-15.76-11.27-4.06-26.56,1.89-39.79,5.07-10.67,5.04-17.26.03-27.89-4.27-10.23-14.63-23.63-7.08-34.45,7.68-9.93,21.07-12.54,30.54-20.13,8.22-6.12,8.89-17.13,10.62-26.44,2.19-13.47,5.52-25.11,21.82-24.27,7.37.22,14.58,2,21.9,2.59,4.82.38,9.94.3,14.32-2.01,4.36-2.26,7.95-5.71,11.46-9.1,6.91-6.45,13.83-15.32,24.03-15.72h0ZM148.76,5.06c-10.19.41-17.06,9.29-23.96,15.73-3.51,3.4-7.1,6.86-11.47,9.13-4.39,2.32-9.54,2.42-14.38,2.04-7.33-.58-14.53-2.35-21.9-2.56-7.84-.37-14.73,2.3-17.9,9.96-5.88,12.69-2.49,31.68-14.38,40.77-15.7,12.03-42.57,14.75-29.7,41.02,3.81,8.9,9.93,17.35,10.28,27.33-.35,9.98-6.46,18.43-10.28,27.33-12.84,26.25,13.94,28.95,29.71,41.01,11.89,9.11,8.5,28.07,14.38,40.78,3.18,7.62,9.99,10.34,17.89,9.95,7.36-.21,14.56-1.98,21.89-2.56,4.85-.38,10-.28,14.39,2.04,4.37,2.28,7.97,5.73,11.48,9.13,6.89,6.45,13.77,15.3,23.94,15.72,10.18-.42,17.04-9.28,23.94-15.72,3.51-3.4,7.11-6.86,11.48-9.13,4.4-2.32,9.55-2.42,14.39-2.04,7.33.58,14.53,2.35,21.89,2.56,7.84.37,14.72-2.29,17.89-9.95,5.89-12.69,2.5-31.68,14.38-40.78,15.7-12.03,42.57-14.75,29.71-41.01-3.81-8.9-9.93-17.35-10.28-27.33.35-9.98,6.47-18.43,10.28-27.33,12.84-26.25-13.93-28.96-29.7-41.02-11.88-9.11-8.49-28.07-14.38-40.77-3.18-7.63-10-10.35-17.9-9.96-7.36.21-14.56,1.98-21.9,2.56-4.84.37-9.99.28-14.38-2.04-4.37-2.27-7.96-5.73-11.47-9.13-6.9-6.45-13.78-15.31-23.96-15.73h0Z"/></g></svg>';
+
+var cluster_large = '<svg data-name="cluster-large" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 297.52 297.52"><g id="path846" class="cls-3"><path style="fill: rgba(255, 0, 153, 0.8)" class="cls-2" d="M148.76,5.03c11.95,0,20.95,21.23,31.97,24.18s29.79-10.75,39.78-4.97c10.13,5.86,7.33,28.74,15.55,36.96,8.22,8.22,31.1,5.43,36.96,15.55s-8.02,28.37-4.97,39.78,24.18,20.02,24.18,31.97-21.23,20.95-24.18,31.97,10.75,29.79,4.97,39.78-28.74,7.33-36.96,15.55c-8.22,8.22-5.43,31.1-15.55,36.96s-28.37-8.02-39.78-4.97-20.02,24.18-31.97,24.18-20.95-21.23-31.97-24.18c-11.4-3.05-29.79,10.75-39.78,4.97-10.13-5.86-7.33-28.74-15.55-36.96s-31.1-5.43-36.96-15.55,8.02-28.37,4.97-39.78-24.18-20.02-24.18-31.97,21.23-20.95,24.18-31.97-10.75-29.79-4.97-39.78,28.74-7.33,36.96-15.55,5.43-31.1,15.55-36.96,28.37,8.02,39.78,4.97,20.02-24.18,31.97-24.18Z"/><path class="cls-1" d="M148.76,5c9.69.35,16.83,12.62,23.52,18.63,3.57,3.6,8.25,6.56,13.52,5.89,10.23-.8,19.46-7.04,29.84-6.78,11.71.8,12.36,15.66,14.66,24.45,1.77,7.96,3.85,15.02,12.4,17.68,9.8,4.09,31.07,2.92,31.92,16.73.29,10.37-5.93,19.66-6.71,29.86-.67,5.25,2.29,9.81,5.86,13.37,3.54,3.66,7.57,6.86,11.23,10.46,9.86,9.35,10.01,16.94.02,26.42-3.66,3.61-7.68,6.81-11.21,10.48-3.57,3.55-6.47,8.08-5.81,13.32.8,10.2,7.06,19.49,6.78,29.88-1.41,16.74-28.86,11.26-38.42,20.71-9.46,9.65-3.86,37.04-20.7,38.52-10.38.32-19.73-5.93-29.9-6.71-5.21-.65-9.63,2.25-13.16,5.79-6.82,6.18-13.85,18.44-23.84,18.82-10-.39-17.04-12.68-23.84-18.83-3.53-3.55-7.96-6.43-13.17-5.79-10.17.78-19.51,7.02-29.9,6.71-16.83-1.45-11.25-28.9-20.7-38.52-9.57-9.45-37.02-4-38.42-20.71-.28-10.39,5.97-19.68,6.78-29.88.68-5.24-2.26-9.76-5.81-13.32-3.53-3.67-7.55-6.87-11.21-10.48-9.84-9.41-10-16.9.02-26.42,3.67-3.6,7.69-6.79,11.23-10.46,3.59-3.55,6.52-8.12,5.86-13.37-.78-10.2-7-19.49-6.71-29.86.82-13.81,22.19-12.65,31.92-16.73,8.57-2.65,10.64-9.78,12.4-17.68,2.29-8.84,2.96-23.63,14.66-24.45,11.67-.81,26.46,10.58,37.26,5.47,2.28-1.14,4.25-2.82,6.1-4.58,6.73-6.06,13.81-18.26,23.52-18.63h0ZM148.76,5.06c-9.66.36-16.77,12.63-23.45,18.64-2.75,2.61-5.9,5.2-9.76,5.8-11.67,1.24-22.05-7.02-33.66-6.61-11.58.79-12.22,15.64-14.49,24.34-1.77,8.02-3.89,15.14-12.51,17.84-9.65,4.07-30.97,2.99-31.73,16.55-.26,10.36,5.96,19.58,6.75,29.82.69,5.31-2.32,10.02-5.93,13.61-3.56,3.69-7.58,6.89-11.23,10.48-9.7,9.23-9.86,16.57,0,25.92,3.65,3.59,7.67,6.79,11.23,10.47,3.63,3.58,6.61,8.31,5.93,13.61-.79,10.24-7,19.46-6.74,29.82,1.28,16.25,28.97,10.93,38.33,20.39,9.46,9.37,4.17,37.05,20.39,38.32,11.61.41,21.99-7.86,33.66-6.62,3.87.6,7.03,3.19,9.78,5.81,6.71,6.05,13.77,18.24,23.43,18.62,9.64-.37,16.76-12.63,23.43-18.62,2.75-2.61,5.91-5.2,9.78-5.81,11.67-1.24,22.05,7.02,33.66,6.62,16.24-1.28,10.93-28.97,20.39-38.32,9.38-9.46,37.05-4.16,38.33-20.39.26-10.36-5.95-19.58-6.74-29.82-.69-5.31,2.32-10.03,5.94-13.61,3.56-3.69,7.58-6.88,11.23-10.48,9.7-9.23,9.87-16.57,0-25.92-3.65-3.59-7.67-6.79-11.23-10.48-3.63-3.58-6.61-8.31-5.93-13.61.79-10.24,7.01-19.46,6.75-29.82-.75-13.57-22.16-12.49-31.73-16.55-8.63-2.69-10.75-9.88-12.51-17.84-2.27-8.75-2.91-23.53-14.49-24.34-11.61-.41-21.99,7.85-33.66,6.61-3.86-.6-7.02-3.19-9.76-5.8-6.71-6.05-13.78-18.25-23.45-18.64h0Z"/></g></svg>';
+
+var cluster_xlarge = '<svg data-name="cluster-xlarge" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 297.52 297.52"><defs><style>.cls-1{fill:url(#linear-gradient);stroke-width:0px;}.cls-2{isolation:isolate;}</style><linearGradient id="linear-gradient" x1="23.08" y1="216.25" x2="274.44" y2="80.74" gradientUnits="userSpaceOnUse"><stop offset="0" stop-color="#6fc"/><stop offset=".3" stop-color="#6fc"/><stop offset=".4" stop-color="#8adab3"/><stop offset=".57" stop-color="#c89c8a"/><stop offset=".69" stop-color="#f0746f"/><stop offset=".76" stop-color="#f66"/><stop offset="1" stop-color="#f66"/></linearGradient><linearGradient id="linear-gradient2" x1="5.3" y1="148.49" x2="292.22" y2="148.49" gradientUnits="userSpaceOnUse"><stop offset="0" stop-color="#f0f"/><stop offset=".06" stop-color="#e033f4"/><stop offset=".16" stop-color="#ac89e3"/><stop offset=".25" stop-color="#86c8d6"/><stop offset=".31" stop-color="#6ef0ce"/><stop offset=".34" stop-color="#6fc"/><stop offset=".41" 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\ No newline at end of file
diff --git a/app/assets/javascripts/graphics/clusters_with_gradient.js b/app/assets/javascripts/graphics/clusters_with_gradient.js
new file mode 100644
index 00000000..95f7e899
--- /dev/null
+++ b/app/assets/javascripts/graphics/clusters_with_gradient.js
@@ -0,0 +1,7 @@
+var cluster_small_with_gradient = '<svg data-name="cluster-small" xmlns="http://www.w3.org/2000/svg" viewBox="0 0 297.52 297.52"><defs><style>.cls-1{fill:url(#linear-gradient);stroke-width:0px;}.cls-2{isolation:isolate;}</style><linearGradient id="linear-gradient" x1="23.08" y1="216.25" x2="274.44" y2="80.74" gradientUnits="userSpaceOnUse"><stop offset="0" stop-color="#6fc"/><stop offset=".3" stop-color="#6fc"/><stop offset=".4" stop-color="#8adab3"/><stop offset=".57" stop-color="#c89c8a"/><stop offset=".69" stop-color="#f0746f"/><stop offset=".76" stop-color="#f66"/><stop offset="1" stop-color="#f66"/></linearGradient><linearGradient id="linear-gradient2" x1="5.3" y1="148.49" x2="292.22" y2="148.49" gradientUnits="userSpaceOnUse"><stop offset="0" stop-color="#f0f"/><stop offset=".06" stop-color="#e033f4"/><stop offset=".16" stop-color="#ac89e3"/><stop offset=".25" stop-color="#86c8d6"/><stop offset=".31" stop-color="#6ef0ce"/><stop offset=".34" stop-color="#6fc"/><stop offset=".41" stop-color="#82e2b9"/><stop offset=".54" stop-color="#c99b89"/><stop offset=".64" stop-color="#f66"/><stop offset="1" stop-color="#f0f"/></linearGradient></defs><g id="path846" class="cls-3"><path class="cls-1" d="M148.76,5.03c24.31,0,42.1,25.16,61.73,36.52,20.25,11.72,50.81,14.94,62.52,35.2,11.36,19.63-.8,47.43-.8,71.75s12.15,52.11.8,71.75c-11.72,20.25-42.27,23.48-62.52,35.2-19.63,11.36-37.42,36.52-61.73,36.52s-42.1-25.16-61.73-36.52-50.81-14.94-62.52-35.2c-11.36-19.63.8-47.43.8-71.75s-12.15-52.11-.8-71.75c11.72-20.25,42.27-23.48,62.52-35.2,19.63-11.36,37.42-36.52,61.73-36.52Z"/><path class="cls-1" d="M148.76,5c23.92.53,39.39,21.8,57.89,34,3.78,2.55,7.83,4.65,11.99,6.5,24.14,10.65,58.19,15.91,59.35,48.62.85,18.34-5.47,36.1-5.47,54.37.05,18.28,6.41,36.01,5.61,54.38-.75,21.32-15.63,31.71-33.89,38.93-12.61,5.22-25.97,8.83-37.38,16.49-11.33,7.7-20.85,17.68-32.33,25.26-7.62,5.08-16.46,8.98-25.77,8.97-9.31,0-18.15-3.88-25.77-8.97-11.48-7.59-21-17.57-32.33-25.26-11.41-7.66-24.77-11.27-37.38-16.49-18.21-7.2-33.15-17.59-33.89-38.93-.8-18.37,5.55-36.1,5.61-54.38,0-18.27-6.32-36.03-5.47-54.37,1.17-32.71,35.19-37.96,59.35-48.62,8.43-3.56,15.89-8.92,22.88-14.76,13.79-11.19,28.09-25.56,47.01-25.74h0ZM148.76,5.06c-23.91.57-39.33,21.84-57.81,34.07-3.78,2.56-7.84,4.67-12.01,6.53-24.02,10.65-58.03,15.91-59.14,48.48-.82,18.32,5.52,36.07,5.55,54.35-.03,18.28-6.36,36.04-5.54,54.35.77,21.15,15.55,31.36,33.66,38.5,12.6,5.19,26.06,8.82,37.5,16.49,11.34,7.68,20.92,17.68,32.36,25.22,7.54,5.02,16.24,8.85,25.44,8.84,9.2,0,17.89-3.81,25.44-8.84,11.44-7.54,21.02-17.54,32.36-25.22,11.43-7.67,24.89-11.3,37.5-16.49,18.06-7.12,32.9-17.34,33.66-38.5.82-18.32-5.51-36.07-5.54-54.35.03-18.29,6.37-36.04,5.55-54.35-1.12-32.57-35.11-37.82-59.14-48.48-4.17-1.86-8.23-3.98-12.01-6.53-18.47-12.23-33.9-33.5-57.81-34.07h0Z"/></g></svg>';
+
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offset=".41" stop-color="#82e2b9"/><stop offset=".54" stop-color="#c99b89"/><stop offset=".64" stop-color="#f66"/><stop offset="1" stop-color="#f0f"/></linearGradient></defs><g id="path846" class="cls-3"><path class="cls-1" 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d="M148.76,0c5.71.37,9.57,11.25,11.91,15.76,2.39,4.61,5.94,14.94,11.23,16.46,3.45.42,6.44-2.09,9.06-4.02,2.67-2.12,5.16-4.46,7.66-6.78,4-3.39,11.63-11.98,17-10.22,5.13,2.53,4.48,14.15,4.92,19.21.67,22.77,2.74,23.67,23.61,15.82,5.04-1.62,15.37-6.59,19.69-2.85,3.79,4.32-1.29,14.85-2.82,19.71-8.05,21.31-6.4,22.8,15.79,23.5,5.33.43,16.72-.23,19.33,4.96,1.88,5.4-6.96,13.29-10.22,17.17-15.59,16.63-14.51,18.52,5.64,27.63,4.8,2.46,15.53,6.24,15.93,12.12-.34,5.89-11.32,9.77-15.92,12.15-20.61,9.28-20.74,11.29-5.58,27.53,3.46,4.07,12.14,11.78,10.27,17.29-2.62,5.33-14.25,4.63-19.45,5.08-22.59.69-23.33,2.54-15.58,23.25,1.65,5.15,6.68,15.52,2.79,19.98-4.42,3.94-15.03-1.19-19.99-2.76-21.16-7.96-22.41-6.46-23.14,15.55-.44,5.45.25,16.89-5.13,19.57-5.6,1.96-13.47-6.93-17.46-10.27-16.52-15.45-18.14-14.42-27.2,5.56-2.51,4.9-6.29,15.71-12.37,16.09-6.09-.35-9.92-11.36-12.37-16.09-9.25-20.53-10.97-20.59-27.21-5.56-4.13,3.49-11.83,12.18-17.45,10.27-5.41-2.65-4.68-14.32-5.13-19.57-.66-22.56-2.46-23.25-23.14-15.55-5.15,1.64-15.53,6.66-19.99,2.76-3.93-4.42,1.22-15.02,2.79-19.98,8.02-21.19,6.47-22.49-15.58-23.25-5.4-.45-16.79.22-19.45-5.08-1.92-5.47,6.97-13.38,10.27-17.29,15.59-16.58,14.51-18.4-5.58-27.54-4.8-2.46-15.53-6.27-15.92-12.15.35-5.88,11.33-9.75,15.93-12.12,20.68-9.26,20.81-11.34,5.64-27.63-3.42-4.04-12.04-11.73-10.22-17.17,2.56-5.21,14.22-4.53,19.33-4.96,22.73-.63,23.58-2.66,15.8-23.5-1.61-5.06-6.57-15.34-2.82-19.7,4.32-3.78,14.84,1.32,19.69,2.85,21.34,8.11,22.88,6.41,23.62-15.82.44-5.28-.2-16.62,4.91-19.21,5.32-1.83,13.17,6.99,17,10.22,16.69,15.73,18.78,14.6,27.96-5.67,2.43-4.71,6.19-15.33,11.91-15.76h0ZM148.76.06c-5.67.38-9.51,11.24-11.83,15.73-2.4,4.64-5.94,15-11.29,16.52-3.51.43-6.5-2.08-9.15-4.03-2.68-2.12-5.17-4.46-7.68-6.78-3.95-3.35-11.61-11.91-16.87-10.18-5.04,2.52-4.38,14.09-4.81,19.09-.44,5.26.25,16.07-4.15,19.57-3.08,1.73-6.8.53-10-.25-6.65-1.42-24.3-10.85-29.17-6.21-3.67,4.24,1.38,14.7,2.88,19.48,1.62,5.07,6.34,14.71,3.58,19.68-2.2,2.77-6.1,3.06-9.36,3.55-6.71,1.21-26.55-.77-29.31,5.42-1.78,5.25,6.99,13.07,10.18,16.86,15.77,16.74,14.63,18.95-5.72,28.14-4.69,2.41-15.28,6.16-15.72,11.82.38,5.66,11.24,9.5,15.72,11.82,4.65,2.4,15.01,5.94,16.53,11.3.43,3.52-2.08,6.51-4.03,9.16-2.12,2.68-4.46,5.17-6.78,7.68-3.35,3.95-11.9,11.6-10.17,16.85,2.52,5.03,14.08,4.37,19.08,4.8,5.26.44,16.08-.25,19.59,4.16,1.74,3.09.54,6.81-.25,10.01-1.42,6.64-10.84,24.29-6.21,29.15,4.24,3.66,14.69-1.39,19.47-2.89,5.07-1.62,14.72-6.34,19.7-3.58,2.78,2.21,3.06,6.11,3.55,9.37,1.21,6.71-.77,26.53,5.41,29.3,5.24,1.77,13.05-6.99,16.84-10.17,4.07-3.45,11.17-11.47,16.85-10.81,3.41.98,5.14,4.5,6.84,7.32,3.67,5.77,9.44,24.76,16.28,24.93,5.65-.39,9.49-11.24,11.81-15.71,2.4-4.65,5.95-15.02,11.31-16.54,3.52-.43,6.51,2.08,9.17,4.04,2.68,2.12,5.17,4.46,7.68,6.78,3.95,3.34,11.59,11.9,16.84,10.17,5.03-2.52,4.37-14.07,4.8-19.07.44-5.27-.25-16.08,4.16-19.59,3.09-1.74,6.81-.54,10.01.25,6.64,1.42,24.29,10.84,29.15,6.22,3.66-4.24-1.38-14.69-2.89-19.47-1.62-5.07-6.34-14.72-3.58-19.7,2.21-2.78,6.11-3.06,9.36-3.55,6.71-1.2,26.54.77,29.3-5.41,1.77-5.24-6.99-13.06-10.17-16.85-15.77-16.75-14.63-18.96,5.72-28.14,4.69-2.41,15.28-6.15,15.72-11.82-.38-5.66-11.24-9.5-15.72-11.82-4.65-2.4-15.01-5.94-16.53-11.3-.43-3.52,2.08-6.5,4.03-9.16,2.12-2.68,4.46-5.17,6.78-7.68,3.35-3.95,11.91-11.6,10.18-16.86-2.52-5.04-14.08-4.38-19.09-4.81-5.26-.44-16.07.25-19.58-4.15-1.73-3.09-.53-6.8.25-10,1.42-6.65,10.85-24.3,6.21-29.17-4.24-3.67-14.7,1.38-19.48,2.88-5.06,1.61-14.71,6.34-19.68,3.58-2.77-2.2-3.06-6.1-3.54-9.35-1.21-6.72.78-26.55-5.42-29.32-5.25-1.78-13.07,6.99-16.87,10.18-16.74,15.76-18.93,14.62-28.12-5.72-2.41-4.69-6.16-15.29-11.83-15.73h0Z"/></g></svg>';
\ No newline at end of file
diff --git a/app/assets/javascripts/layers.js.erb b/app/assets/javascripts/layers.js.erb
index 1b600627..bce999b1 100644
--- a/app/assets/javascripts/layers.js.erb
+++ b/app/assets/javascripts/layers.js.erb
@@ -11,11 +11,15 @@ function ShowPlacesForLayer(map,text_layers,image_layers,marker_meta_layers,curv
 
   // how to set data.id dynamically?
   var data_id = 1;
+
+  var marker_display_mode = $('#selection').data('map-marker-display-mode');
+
   var markerclusterSettings = {
           maxClusterRadius: 30,
           showCoverageOnHover: false,
           animate: true,
           iconCreateFunction: function(cluster) {
+            if ( marker_display_mode == 'cluster' ) {
               return L.divIcon({
                 html: '<div class="marker-cluster marker-cluster-small marker-cluster-layer-' + data_id + '"><div>' + cluster.getChildCount() + '</div></div>',
                 className: "leaflet-data-markercluster",
@@ -23,11 +27,28 @@ function ShowPlacesForLayer(map,text_layers,image_layers,marker_meta_layers,curv
                 iconSize    : [30, 30],
                 popupAnchor : [0, -28]
               });
-            },
-
-
+            } else {
+              console.log("Zigzgag Cluster!!");
+              console.log(cluster.getChildCount());      
+              let cluster_viz = ( marker_display_mode === 'zigzag cluster' ? cluster_small : cluster_small_with_gradient );
+              if ( cluster.getChildCount() >= 10 ) {
+                cluster_viz = ( marker_display_mode === 'zigzag cluster' ? cluster_xlarge : cluster_xlarge_with_gradient );
+              } else if ( cluster.getChildCount() >= 6 ) {
+                cluster_viz = ( marker_display_mode === 'zigzag cluster' ? cluster_large : cluster_large_with_gradient );
+              } else if ( cluster.getChildCount() >= 3 ) {
+                cluster_viz = ( marker_display_mode === 'zigzag cluster' ? cluster_medium : cluster_medium_with_gradient );
+              } 
+              let rnd_rotate = Math.floor(Math.random()*25) * 15;
+              return L.divIcon({
+                html: '<div class="marker-cluster marker-cluster-small marker-cluster-layer-' + data_id + '" style="transform: rotate('+rnd_rotate+'deg);">' + cluster_viz + '</div>',
+                className: "leaflet-data-markercluster",
+                iconAnchor  : [15, 15],
+                iconSize    : [30, 30],
+                popupAnchor : [0, -28]
+              });
+            }
+          },
           spiderLegPolylineOptions: { weight: 0, color: '#efefef', opacity: 0.5 },
-
           elementsPlacementStrategy: "clock",
           helpingCircles: true,
           clockHelpingCircleOptions: {
@@ -77,15 +98,17 @@ function ShowPlacesForLayer(map,text_layers,image_layers,marker_meta_layers,curv
       var params = getParams();
 
       var clustercolor = '#445';
+      
       if ( level !== 'maps') {
         console.log("Render places of one layer");
         console.log(data);
-        if ( $('#selection').data('map-marker-display-mode') == 'single' ) {
+        if ( marker_display_mode == 'single' ) {
           var marker_layers =  L.featureGroup();
         } else {
           var marker_layers = L.markerClusterGroup(markerclusterSettings);
         }
         clustercolor = data.color;
+        clustercolor = 'rgba(255, 0, 153, 0.8)';
         var places = [];
         if (level === 'places') {
           places = data.places;
@@ -101,10 +124,10 @@ function ShowPlacesForLayer(map,text_layers,image_layers,marker_meta_layers,curv
           $('.marker-cluster-small').addClass('marker-layer-'+data.id);
         } else {
           console.log("DRAW MARKER");
-          drawMarkers(map,data.id,data.ltype,level,String(false),text_layers,image_layers,marker_layers,params,data.color,clustercolor,places);
+          drawMarkers(map,data.id,data.ltype,level,String(false),text_layers,image_layers,marker_layers,params,data.color,places);
           $('.marker-cluster-small').addClass('marker-layer-'+data.id);
         }
-        drawCurves(map,data.id,curve_layers,marker_layers,data.color,clustercolor,places_with_relations,data.relations_bending,data.relations_coloring);
+        drawCurves(map,data.id,curve_layers,marker_layers,data.color,places_with_relations,data.relations_bending,data.relations_coloring);
         marker_meta_layers.addLayer(marker_layers);
 
       } else  {
@@ -117,7 +140,7 @@ function ShowPlacesForLayer(map,text_layers,image_layers,marker_meta_layers,curv
         });
         var show_annotations_on_map = data.show_annotations_on_map;
 
-        if ( $('#selection').data('map-marker-display-mode') == 'single' ) {
+        if ( marker_display_mode == 'single' ) {
           marker_layers =  L.featureGroup();
         } else {
           marker_layers = L.markerClusterGroup(markerclusterSettings);
@@ -127,14 +150,19 @@ function ShowPlacesForLayer(map,text_layers,image_layers,marker_meta_layers,curv
         $.each(all_places, function(key,data) {
           clustercolor = 'rgba(0, 54, 193, 0.9)';
           clustercolor = 'rgba(50, 54, 153, 0.9)';
+
+          clustercolor = '#ff0099';
+          clustercolor = 'rgba(255, 0, 153, 0.8)';
+
           /* grayish 
           clustercolor = 'rgba(100, 104, 103, 0.9)';
           if ( localStorage.baselayer == 'Satellite' ) {
             clustercolor = 'rgba(220, 224, 223, 0.9)';
           }
+          
           */
           console.log(data);
-          drawMarkers(map,data.id,data.layer_type,level,show_annotations_on_map,text_layers,image_layers,marker_layers,params,data.layer_color,clustercolor,[data]);
+          drawMarkers(map,data.id,data.layer_type,level,show_annotations_on_map,text_layers,image_layers,marker_layers,params,data.layer_color,[data]);
         });
         marker_meta_layers.addLayer(marker_layers);
 
@@ -156,7 +184,7 @@ function ShowPlacesForLayer(map,text_layers,image_layers,marker_meta_layers,curv
           }
           */
           console.log("Places_with_relations: "+data.places_with_relations.length);
-          drawCurves(map,data.id,curve_layers,marker_layers,data.color,clustercolor,data.places_with_relations, data.relations_bending,data.relations_coloring);
+          drawCurves(map,data.id,curve_layers,marker_layers,data.color,data.places_with_relations, data.relations_bending,data.relations_coloring);
           marker_meta_layers.addLayer(marker_layers);
         });
 
@@ -176,10 +204,10 @@ function ShowPlacesForLayer(map,text_layers,image_layers,marker_meta_layers,curv
           "#map .marker-cluster-medium," +
           "#map .marker-cluster-small {" +
           "    background-color: transparent;" +
-          "    border: 3px solid " + clustercolor + ";" +
+          "    border: 0px solid " + clustercolor + ";" +
           "    opacity: 0.9;" +
-          "    width: 40px;" +
-          "   height: 40px;" +
+          "    width: 36px;" +
+          "   height: 36px;" +
           "   display: flex;" +
           "   align-items: center;" +
           "   justify-content: center;" +
diff --git a/app/assets/javascripts/markers/draw_markers.js.erb b/app/assets/javascripts/markers/draw_markers.js.erb
index 090b17ab..832328f0 100644
--- a/app/assets/javascripts/markers/draw_markers.js.erb
+++ b/app/assets/javascripts/markers/draw_markers.js.erb
@@ -1,6 +1,6 @@
 
 
-function drawMarkers(map,layer_id,layer_type,level,show_annotations_on_map,text_layers,image_layers,marker_layers,params,color,clustercolor,places) {
+function drawMarkers(map,layer_id,layer_type,level,show_annotations_on_map,text_layers,image_layers,marker_layers,params,color,places) {
     var c = 0;
     var marker_size = 30;
     if ( layer_type === 'image' ) {
@@ -12,7 +12,7 @@ function drawMarkers(map,layer_id,layer_type,level,show_annotations_on_map,text_
         options: {
             iconSize:     [marker_size, marker_size],
             iconAnchor:   [15, 15],
-            popupAnchor:  [-2, -15]
+            popupAnchor:  [0, -15]
         }
     });
     var CustomSmallIcon = L.Icon.extend({
@@ -58,7 +58,20 @@ function drawMarkers(map,layer_id,layer_type,level,show_annotations_on_map,text_
         if (color.indexOf('#') == -1) {
           color = '#'+color;
         }
-        var svg = "<svg height='"+marker_size+"' width='"+marker_size+"' xmlns='http://www.w3.org/2000/svg'><circle cx='"+marker_size/2+"' cy='"+marker_size/2+"' r='"+marker_size/2+"' fill='"+this_color+"' fill-opacity='"+opacity+"' stroke='"+stroke+"' stroke-width='"+stroke_width+"' stroke-opacity='"+stroke_opacity+"'  shape-rendering='geometricPrecision'></circle></svg>";
+
+        // TODO: only if gradient is selected
+        // TODO: remove box shadow
+        // TODO: rotate gradient
+        var marker_display_mode = $('#selection').data('map-marker-display-mode');
+        var defs_with_gradient = '';
+        if ( marker_display_mode === 'zigzag cluster, w/gradient' ) {
+          console.log("!!!!Marker display mode: "+marker_display_mode);
+          opacity = '0.85'
+          defs_with_gradient = '<defs><style>.cls-1{fill:url(#linear-gradient);stroke-width:0px;}</style><linearGradient id="linear-gradient" x1="23.08" y1="216.25" x2="274.44" y2="80.74" gradientUnits="userSpaceOnUse"><stop offset="0" stop-color="#f0746f"/><stop offset=".24" stop-color="#f0746f"/><stop offset=".31" stop-color="'+color+'"/><stop offset="1" stop-color="'+color+'"/></linearGradient></defs>';
+        }
+        
+        var svg = '<svg height="'+marker_size+'" width="'+marker_size+'" xmlns="http://www.w3.org/2000/svg">'+defs_with_gradient+'<circle class="cls-1" cx="'+marker_size/2+'" cy="'+marker_size/2+'" r="'+marker_size/2+'" fill="'+color+'" fill-opacity="'+opacity+'" stroke="'+stroke+'" stroke-width="'+stroke_width+'" stroke-opacity="'+stroke_opacity+'" shape-rendering="geometricPrecision"></circle></svg>';
+
         var url = encodeURI("data:image/svg+xml," + svg).replace(new RegExp('#', 'g'),'%23');
         var icon;
         if ( layer_type === 'image' ) {
diff --git a/app/assets/javascripts/relations/draw_curves.js.erb b/app/assets/javascripts/relations/draw_curves.js.erb
index 26a7a645..e5eec5da 100644
--- a/app/assets/javascripts/relations/draw_curves.js.erb
+++ b/app/assets/javascripts/relations/draw_curves.js.erb
@@ -1,5 +1,5 @@
 
-function drawCurves(map,layer_id,curve_layers,marker_layers,color,clustercolor,places_with_relations,bending,coloring) {
+function drawCurves(map,layer_id,curve_layers,marker_layers,color,places_with_relations,bending,coloring) {
 
   var boost = ( 2.9 * bending ) + 0.1;
   console.log("Boost: "+boost);
@@ -12,8 +12,8 @@ function drawCurves(map,layer_id,curve_layers,marker_layers,color,clustercolor,p
       var point2 = [Number(relation.to.lat), Number(relation.to.lon)];
 
       var color = 'rgba(225,25,25,0.75)';
-      var color = '#'+Math.floor(Math.random()*16777215).toString(16);
-      var color = "hsl(" + Math.random() * 360 + ", 100%, 85%)";
+      color = '#'+Math.floor(Math.random()*16777215).toString(16);
+      color = "hsl(" + Math.random() * 360 + ", 100%, 85%)";
       // var color = clustercolor;
       if ( coloring == 'black') {
           color = '#000000'
@@ -26,7 +26,7 @@ function drawCurves(map,layer_id,curve_layers,marker_layers,color,clustercolor,p
           weight: 4,
           opacity: 0.5,
           className: 'curve_normal curve_'+relation.from.id,
-          animate: false
+          animate: true
       }
       var distance =  L.latLng(point1).distanceTo( L.latLng(point2));
       let distance_in_kms = ((distance) / 1000).toFixed(2);
diff --git a/app/assets/stylesheets/4_map.css.scss b/app/assets/stylesheets/4_map.css.scss
index b58f23ac..9e7d4cae 100644
--- a/app/assets/stylesheets/4_map.css.scss
+++ b/app/assets/stylesheets/4_map.css.scss
@@ -196,7 +196,10 @@
 }
 /* ............................. */
 #map.darken-icons img.leaflet-marker-icon {
-    filter: saturate(200%) drop-shadow(0 0 2px #888);
+    filter: saturate(200%) drop-shadow(0 0 1px #888);
+}
+#map.darken-icons.gradient-icons img.leaflet-marker-icon {
+  filter: saturate(200%);
 }
 #map.darken-icons .text_inner {
     color: #333;
diff --git a/app/helpers/maps_helper.rb b/app/helpers/maps_helper.rb
index 289e0a28..a6e16f36 100644
--- a/app/helpers/maps_helper.rb
+++ b/app/helpers/maps_helper.rb
@@ -7,7 +7,8 @@ def popup_display_mode_for_select
   end
 
   def marker_display_mode_for_select
-    marker_display_modes = %w[cluster single]
+    # array with three values
+    marker_display_modes = ['cluster', 'zigzag cluster', 'zigzag cluster, w/gradient', 'single']
     marker_display_modes.each_with_object({}) { |e, m| m[e.capitalize] = e }
   end
 end
diff --git a/app/views/maps/_form.html.haml b/app/views/maps/_form.html.haml
index 377df0b9..790ea3d8 100644
--- a/app/views/maps/_form.html.haml
+++ b/app/views/maps/_form.html.haml
@@ -52,7 +52,7 @@
             %p
               = f.input :marker_display_mode, :collection => marker_display_mode_for_select, :input_html => { :class => '' }, label: 'Marker display mode'
             %p.hint
-              Choose, if near-by or overlapping markers should displayed as a marker cluster (default) or as single markers.
+              Choose, if near-by or overlapping markers should displayed as a marker cluster (default) or as single markers. NEW: You can choose also a colorized version of marker cluster :)
 
           .large-4.medium-4.small-6.cell
             %p
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index f8c80034..9e2fc27f 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -11,6 +11,7 @@
                                '0.0.0.0',
                                '127.0.0.1',
                                'chromedriver.storage.googleapis.com',
+                               'storage.googleapis.com',
                                'googlechromelabs.github.io',
                                'storage.googleapis.com',
                                'edgedl.me.gvt1.com'
diff --git a/spec/support/files/test-with-exif-data1.jpg b/spec/support/files/test-with-exif-data1.jpg
new file mode 100644
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