Charles Perry Ball Puzzle Variety Box once you know the secret

once you know the secret

which rings like a bell (see video below)

and motor (9 Volt battery not included)

surrounded by curling clouds and a fiery round sun

Charles Perry Ball Puzzle Variety Box once you know the secretThis timeless treasure of mathematical art is a favorite among puzzle aficionados. After a long absence from the marketplace (and some astronomical prices for vintage copies), we are proud to announce that our diligent pestering of the Perry family has resulted in a brand new production run of the famous Charles O. Perry Ball Puzzle, originally created in 1967. Perry was a sculptor and designer known for creating monumental structures with elegant