Rainbow Pyramid was a play area at Tokyo Sesame Place. It was the same as the Rainbow Pyramids in Texas and Pennsylvania.
Guests would toss a ball at a pyramid that had jets of air coming out of it.
Air rushing over top of the spinning ball would move faster than the air below keeping the ball suspended.
Image from http://kozaru98.fc2web.com
The signage in Tokyo had Sesame Street character Dr. Nobel Price:
Image from YouTube