The Cellular Automata of John von Neumann
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Program modes
 
The program runs in two mutually exclusive working modes or program environments: the Draw & Run mode and the Cut & Paste mode. On the left of the Symbol bar (the top bar where the cell symbols are displayed), an inscription in dark blue notifies the current working mode.
   At start, the program is set in the Draw & Run mode. To change to the Cut & Paste mode, click button Image Select.GIF (Select) on the Top toolbar (just above the Symbol bar) or choose Select in menu Edit. To go back to the Draw & Run mode, click button Image Deselect.GIF (Deselect), near button Select, or choose Deselect in menu Edit.
   We recommend you practice in both modes to reach a clear understanding of how the cellular automata work.