You could 3d print skulls for gate markers!The one I am referring to had the pointy flags, and there were different colored ones on the course, pointing different directions. It was Indonesian or something. But I like the idea of the little balls, since you just move them around. Not sure even a ping pong ball would look right though. I mean if you scale it up it would be the size of a wheel and tire. Maybe I will just print some scale cones. I could put a hole in the top to stick a flag pointing to the course
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