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Magnet on a spinning wheel beneath the dominoes, neat idea.

It's cutting most of the back yard (a large circle) by wrapping a rope around a couple of stakes.

Actually, it's a circular mill, first described in army ants by Schneirla (1944). A circle of army ants, each one following the ant in front, becomes locked into a circular mill. They will continue to...

They're running like mad in circles!

Another ant death spiral.

I think the board unambiguous.