That is the entire system. I worked it out in about four seconds and I have not needed to revisit it once since.

They do a small thing. I do not know what the small thing is. If I think about it, the hoop drops immediately.
People walk past, watch for a bit, and then ask how long I have been at it. That question has never once helped.

Up. Always up. If they come down the whole thing stops working and I have to start from the beginning.