Fixup the-nature-of-code: digital-world.rkt: make the world inherit frame%
Fixup the-nature-of-code: random.rkt: random-noise: a more general way
Update the-nature-of-code: random-walks.rkt, digital-world.rkt: make it more functional
Update the-nature-of-code: random-walks.rkt, digital-world.rkt: make it more functional(Beauty-Splatters-Walker)