A theorem walks into a bar...
The Klein Bottle is a mathematical joke: a surface with only one side. This one feels just right in your hand and opens bottles with ease and style. Built to last in steel, it's the perfect touch for any math fan's kitchen.

Yes, it really works!

Klein not-a-bottle-opener is here.

This detailed model of the moon is hollow and therefore very price efficient. It will balance on a small gap on the bottom. You can also hang it on a wire using a bent paperclip. See video and images. Made for full color sandstone.

The Earth, Moon, and Mars, to scale, with 3D surface terrain and full color from the latest NASA space imaging.

[See also the solar system set (but note that set is a logrithmic scale, not linear like this one)]

Dimensions:
Earth: 50mm (2 inches) diameter
Mars: 27mm (1 inches) diameter
Moon: 13mm (0.54 inches) diameter

Scale: 1 : 251102362

The Earth and Mars globes are hollow, with a 12mm (1/2 inch) hole at the south pole, giving them a flat bottom on which to sit without rolling, but each also comes with a matching cap/plug to seal that hole, to form a full sphere. (The moon is solid)

Special thanks to NASA / JPL-Caltech, for allowing the use of their planet surface terrain and mapping.

New design, still waiting for proof prints before putting it on sale.