Pictogram for quickly determining modulo 7

REF: http://blog.tanyakhovanova.com/?p=262

[excerpt quote="
For example, let n = 325. Start at node 0, move along 3 black arrows (to 
node 3), then 1 white arrow (to node 2), then 2 black arrows (to node 
4), then 1 white arrow (to node 5), and finally 5 black arrows (to node 
3). Finishing at node 3 shows that the remainder on dividing 325 by 7 is 3.
" \]

Neat-O!

Makes one want to get out their pencils and see if they can draw similar 
ones for other modulos, no?

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