Hehe. Yeah, paper notepads would be nice, but they aren't big enough (they'd have to be tens of meters wide), and if I taped them together, they'd be difficult to handle. Also, erasing stuff is a pain. At one point I was considering using a wall paint for writing on the walls :).

Obsidian is probably a nice tool, but I'd like to have my rigid grid. Graphs are ok, but I don't like how inexact they are.

I'd like just to type, and click switching between cells.