One of my students demonstrated Speed Stacking (also known as Sport Stacking) to me one afternoon. He stacked cups in pyramids and then tried to unstack them at a high speed. The cups have to be stacked in pre-determined sequences of three, six, or ten.
This sport originated in the United States in the early 1980s to teach basic motor skills to autistic children.
The cups are specially designed. They are made of plastic to prevent sticking to one another and with holes in the bottom to allow air to pass through quickly when stacking.
The little fellow would complete the formations in 30 seconds!
I kept forgetting the sequences and dropping the cups when he tried teaching me. After one frustrating hour, he gave up. The teacher is too clumsy and stupid to pick up this sport. hahaha........
First Commenter - Levian