I just found out about Tatsuo Horiuchi and his amazing art, which he... creates in excel of all things.
If you want to get a taste of what the heck I'm talking about, here are two official online gallery sites:
http://www2.odn.ne.jp/~cbl97790/shinsakutenjishitu.htm
http://www2.odn.ne.jp/~cbl97790/shinsakutenjishitu2.htm
Official international homepage for the sake of completeness: https://pasokonga.com/