Claude Gaspar Bachet de Méziriac's interpretation of the Josephus problem with 41 soldiers and a step size of 3, visualised by CMG Lee. Time progresses inwards along the spiral, green dots denoting live soldiers, grey dead soldiers, and crosses killings. The helmet icon is from http://commons.wikimedia.org/wiki/File:Hoplite_helmet.svg .
Hoplite helmet.svg
cmglee, F l a n k e r