<b_jonas> slashlearn farbfeld//zzo38\'s Farbfeld utilities is a package of command-line programs (with rather strange command-line syntax) for manipulating images in a specific raw format called farbfeld. It\'s somewhat underdocumented. http://zzo38computer.org/fossil/farbfeld.ui/home

A zygohistomorphic prepromorphism is used when you really need both semi-mutual recursion and history and to repeatedly apply a natural transformation as you get deeper into the functor.