Munching square

The Munching Square is a display hack dating back to the PDP-1, which employs a trivial computation to produce an impressive display of moving and growing squares that devour the screen. The initial value of T is treated as a parameter, which, when well-chosen, can produce intricate effects. Some of these, later discovered on the LISP machine, have been christened munching triangles, munching w's, and munching mazes. More generally, suppose a graphics program produces an ever-changing display of some basic form, foo, on a display terminal, and does it using a relatively simple program; then the program is likely to be referred to as munching foos.