Everyone drawson the same wall.
Draw. Smudge. Leave your mark.
Pay if you want it to stick.
One wall. Everyone gets the same one.
Draw
Pick a colour, click a square. Signing up takes about thirty seconds, and the squares stay free — a few at a time, so each one matters.
Smudge
Anyone can draw over anything. What's on the wall this morning is probably not what's there tonight.
Stick
If you want your drawing to survive, lock it. It stays put for as long as you paid for, then it's fair game again.