Audio representation [of cellular automata]
A step in the evolution of a cellular automaton can be represented as a sound by treating each cell like a key on a piano, with the key taken to be pressed if the cell is black. This yields a chord such as
Play[Evaluate[Apply[Plus, Flatten[Map[Sin[1000 # t] &, N[21/12]^Position[list, 1]]]]], {t, 0, 0.2}]
A sequence of such chords can sometimes provide a useful representation of cellular automaton evolution. (See also page 1080.)