Vortex Fidget Cone

The moment I took the first one off the printer I couldn't stop playing with it (the vortex cone, that is).

You can put the top on the bottom. You can put the bottom on the top. You can place one piece upside down and make them kiss, then slide onto each other!

The pieces are cleverly designed to pass through one another, even though it looks like they shouldn't necessarily.

I can't really describe the joy of playing this much more without starting to sound like a raving lunatic, so please get one of your very own and see what I'm talking about.