In Circles

some ways in this maze only lead you round.

a hand-drawn maze with loops: draw from start to end without crossing a line; go round a loop and the circle you drew drops away

From Daniel Fabe Schmidt's book Maze Structure: a loop never dead-ends, so it can feel like progress while you go round and round. Your own line is the record: meet it again and you know you have been here.

Concepts: mazes, graphs, topology.

An interactive you play with one thumb, on Wundr.