The most interesting use of my fingers for numbers and computation were for playing perfect strategy in the game of Nim (back in high school). I just represente

The most interesting use of my fingers for numbers and computation were for playing perfect strategy in the game of Nim (back in high school). I just represented numbers between 0 and 15 in binary on one hand by slightly bending the fingers corresponding to bit positions for binary digits. Nim is a simple game played with coins or markers distributed into a number of piles. Players alternately remove one or more markers from a pile of their choosing. The player removing the last marker loses. The game starts with any number of piles, typically 3 or 4, and any number of markers in each of the piles. Using one hand (and knowing binary) it’s easy to mystify opponents.