<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

categorical product is like when you have two category elements A and B then their product is element C iff there are two morphisms p:C->A and q:C->B such that for every element X and morphisms u:X->A and v:X->B there is a unique morphism w:X->C such that u=wp and v=wq.