turtle geometry
turtle interpretation

Koch　(Niels Fabian Helge von Koch)

Mandelbrot (Benoît B. Mandelbrot)

Wolfram (Stephen Wolfram)

Conway (John Horton Conway)

Thue (Axel Thue)

Chomsky (Avram Noam Chomsky)

Backus-Naur form (BNF)

Aristid Lindenmayer

Venn-diagram

Parallel / sequential