Recreational Mathematics(4)

Still on the subject, I did some work (along with Alda Carvalho and Jorge Nuno Silva) for ENSPM08. The idea was to build several sketches in dynamic geometry software illustrating concepts from Flatland and its sequels. Here it is a chess game on a unidimensional board:

For a good historical perspective on recreational mathematics see the work of David Singmaster. And some excellent links:

Two classics:

And, of course, one can not proceed without Martin Gardner: