diff --git a/double-dispatch/etc/double-dispatch.png b/double-dispatch/etc/double-dispatch.png
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diff --git a/double-dispatch/etc/double-dispatch.ucls b/double-dispatch/etc/double-dispatch.ucls
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--- /dev/null
+++ b/double-dispatch/etc/double-dispatch.ucls
@@ -0,0 +1,84 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<class-diagram version="1.1.8" icons="true" automaticImage="PNG" always-add-relationships="false" generalizations="true" 
+  realizations="true" associations="true" dependencies="false" nesting-relationships="true">  
+  <class id="1" language="java" name="com.iluwatar.SpaceStationIss" project="double-dispatch" 
+    file="/double-dispatch/src/main/java/com/iluwatar/SpaceStationIss.java" binary="false" corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="84" y="1111"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </class>  
+  <class id="2" language="java" name="com.iluwatar.FlamingAsteroid" project="double-dispatch" 
+    file="/double-dispatch/src/main/java/com/iluwatar/FlamingAsteroid.java" binary="false" corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="372" y="1111"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </class>  
+  <class id="3" language="java" name="com.iluwatar.SpaceStationMir" project="double-dispatch" 
+    file="/double-dispatch/src/main/java/com/iluwatar/SpaceStationMir.java" binary="false" corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="84" y="929"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </class>  
+  <class id="4" language="java" name="com.iluwatar.Meteoroid" project="double-dispatch" 
+    file="/double-dispatch/src/main/java/com/iluwatar/Meteoroid.java" binary="false" corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="372" y="929"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </class>  
+  <class id="5" language="java" name="com.iluwatar.Rectangle" project="double-dispatch" 
+    file="/double-dispatch/src/main/java/com/iluwatar/Rectangle.java" binary="false" corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="254" y="323"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </class>  
+  <class id="6" language="java" name="com.iluwatar.GameObject" project="double-dispatch" 
+    file="/double-dispatch/src/main/java/com/iluwatar/GameObject.java" binary="false" corner="BOTTOM_RIGHT">    
+    <position height="-1" width="-1" x="255" y="648"/>    
+    <display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+      sort-features="false" accessors="true" visibility="true">      
+      <attributes public="true" package="true" protected="true" private="true" static="true"/>      
+      <operations public="true" package="true" protected="true" private="true" static="true"/>    
+    </display>  
+  </class>  
+  <generalization id="7">    
+    <end type="SOURCE" refId="3"/>    
+    <end type="TARGET" refId="6"/>  
+  </generalization>  
+  <generalization id="8">    
+    <end type="SOURCE" refId="1"/>    
+    <end type="TARGET" refId="3"/>  
+  </generalization>  
+  <generalization id="9">    
+    <end type="SOURCE" refId="2"/>    
+    <end type="TARGET" refId="4"/>  
+  </generalization>  
+  <generalization id="10">    
+    <end type="SOURCE" refId="4"/>    
+    <end type="TARGET" refId="6"/>  
+  </generalization>  
+  <generalization id="11">    
+    <end type="SOURCE" refId="6"/>    
+    <end type="TARGET" refId="5"/>  
+  </generalization>  
+  <classifier-display autosize="true" stereotype="true" package="true" initial-value="false" signature="true" 
+    sort-features="false" accessors="true" visibility="true">    
+    <attributes public="true" package="true" protected="true" private="true" static="true"/>    
+    <operations public="true" package="true" protected="true" private="true" static="true"/>  
+  </classifier-display>  
+  <association-display labels="true" multiplicity="true"/>
+</class-diagram>
\ No newline at end of file