Animation of the AES algorithm

Shows how, but doesn't explain why, which make it completely pointless.

I am more interested in who did the animations. I need such animations to describe our software.

On step 4, AddRoundKey, shouldn't e5+17 be fc, not f2? Or is AES using something other than simple 8-bit modular arithmetic? It looks like the author did the arithmetic in his/her head, and accidentally used decimal for the second digit (5 + 7 = 12, mod 10 = 2).