I think if a maze has an entrance and and exit, and there's some surface tension at the leading edge, when you pour water into the entrance, it'll fill the maze

I think if a maze has an entrance and and exit, and there's some surface tension at the leading edge, when you pour water into the entrance, it'll fill the maze like a breadth first search. as soon as the water can flow freely at the exit it'll drain because there's less resistance at the exit. pour a little water on a counter and you'll get a round area with little walls at the edge, if it's not clean it'll kinda break down where it's dirty (surface tension doesn't hold up) once it hits the edge of the counter, the surface tension pushes all the water over the edge. if it's a perfectly flat clean surface it'll make a perfect circle till it hits the edge. so the water won't fill every nook and cranny of the maze, it'll start a new circle at every decision point, till one of those circles goes over the edge.