The SciencesComputer Recreations, September 1989Two-dimensional Turing machines and tur-mites make tracks on a planeBy A. K. Dewdney on September 1, 1989AdvertisementABOUT THE AUTHOR(S)Recent Articles by A. K. DewdneyDIY Fractals: Exploring the Mandelbrot Set on a Personal ComputerPhotovoresTuring Test