Err

Where science meets magic and fun meets education!

Maths Toys

Chichen Itza - a symmetry puzzle
For dedicated fidgeters only! What a joy only three pieces can bring to idle hands...
£ 7.99
Broken Twig - a symmetry puzzle
Rearrange the custom metal "twigs” until they form a symmetrical shape.
£ 7.99
The Chimera - a symmetry puzzle
Two metal pieces, limitless possibilities of arranging them, but only one solution! 
£ 7.99
Stem Lab - PENDULUM
The Pendulum kit is designed to serve as a learning tool rather than a puzzle...
£ 15.99
Geobender Cube "Abstract-2"
Abstract-2 - a new design of the GeoBender magnetic puzzle...
£ 24.00
Geobender Cube "Bees"
Bees - a new design of the GeoBender magnetic puzzle...
£ 24.00
Geobender Cube "Surfer"
The GeoBender is a new design of magnetic puzzle...
£ 24.00
Geobender Cube "Nautilus"
GeoBender is an elegant and sophisticated 3D magnetic puzzle...
£ 24.00
Magic Cube
An elegant, transforming geometric puzzle, based on the Yoshimoto Cube.
£ 9.99
Non Transitive Dice - Set 1
These so-called 'Non Transitive Dice' (Magic Dice) demonstrate a probability that violates common sense and traps the unwary.
£ 3.99
Non Transitive Dice - Set 2
Another variation on Non Transitive Dice, this time based on a set of three dice.
£ 3.99
Sicherman Dice
An unusual pair of dice. Martin Gardner reported on the discovery of these dice by a certain Colonel George Sicherman, of Buffalo, New York, in a...
£ 3.99
Educated Monkey
A really charming tin toy this one. We like it a lot!
£ 13.99
Solids of Constant Width
A set of 3 solids of constant width, made from solid aluminium, with a width of 35mm. Whichever way you roll them, their width is always the same!
£ 32.99
Dudeney's Dissection
We are very proud to be able to offer this beautiful physical version of Dudeney's Dissection, where the 4 pieces are hinged, so that you can...
£ 110.00
Napiers Bones
'Napier's Bones' is an early calculating device that allowed the user to carry out multiplication and division.
£ 22.99