I first saw one back in the 70s as a kid at a summer activity. I had made a sharp double folded dart that I would throw furiously towards the rafters to trace a

I first saw one back in the 70s as a kid at a summer activity. I had made a sharp double folded dart that I would throw furiously towards the rafters to trace a ballistic arc and land almost point down. I was easily beat by a ring an older kid gently launched from the elevated stage that glided and swooped well past where my dart landed.