                                                      +--------+         ***                     
                  /---------------/   /---------/\    |callout |     ****   ****     /---------\ 
 +----------+    /               /   |         |  |   +--------+  ***  diamond  *** /           \
 |rectangle |   / parallelogram /    |   queue |  |        | /      ****     ****   \  hexagon  /
 |          |  /_______________/      \________ \/         |/           *****        \_________/ 
 +----------+                                                                                    
       |                 |                  |              |              |                |     
       v                 v                  v              v              |                v     
  +---------+      +----------+        +----+        /-----------/        v          +@---------+
  |         |      | document |        |    +----+  /           /    +O--------+     |          |
  | square  |      |     .-`-.|        | package | | stored_data     |  oval   |     |  cloud   |
  |         |       `-.-`              +---------+  \           \    |         |     |          |
  |         |                                        \___________\   +---------+     |          |
  +---------+            |                  |              |              |          +----------+
       |                 |                  |              |              |                      
       v                 v                  v              v              |                      
   +-----+          .------.          \------- \         /--\             v                      
   |     \+        |\-____-/|          \        \        \__/        +O--------+                 
   | page |        |        |           \        \      /----\       |         |                 
   |      |        |        |           / step   /      ------       | circle  |                 
   +------+        |cylinder|          /        /       person       |         |                 
                   |        |         /_______ /                     |         |                 
                    \-____-/                                         +---------+                 
