Print and assemble this Cartesian Diver, named after famed French philosopher, mathematician and scientist Renee Decartes.

Demonstrating the mechanics of buoyancy and the ideal gas law, this toy has fascinated young and old for centuries.

In addition to your printed parts the only materials you'll need is a balloon, a soda bottle and some instant glue.

It makes an entertaining and attractive demonstration piece and a great gift!


There's a great write up on the Cartesian Diver on wikipedia, along with lot of links to related subjects