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Great demonstration of conservation of momentum for the engineers and fun for the kids who don't care why it does what it does. Very nicely machined and the concave mirror keeps it from running away...

This is not as pretty as some larger Rattelbacks that I have found. That said, the movable weights provide a nice way to explain why it works.

Nicely machined. Everyone is surprised by its "staying power." It is even better when placed on the concave mirror that comes with the Euler's Disk because the small curvature keeps the top from...

Item as described, no issues at all with it. It has become a much loved Christmas present and has proved an item of fascination for visitors.

The only way to really see the magic mirror image

An excellent way to teach children about 3D

We love this magnetic demonstration

It is great the illusion shocks all my friends and family to how it works it was a good buy,

I would have appreciated knowing the dimensions of the specs case, as my husband's glasses only just fit into it.