Lisp stuff

I was inspired, mostly by Paul Graham, and particularly this essay, to revisit lisp. Now, I often find myself, when coding in other languages, saying, "Oh, that's easy, I'll just.... no, that won't work, that's a lisp feature that isn't available here. Grrr."

A Sudoku game.

A graphical physics solver, computing voltages in a two-dimensional grid.