Paradoxical Elastic Squares

A math-magic article I wrote for the German magazine Zeit Wissen: with the 13 triangular and square pieces (fig. 1) it is possible to form two large squares shown in fig. 2. Though the second large square has an extra piece the dimensions of the squares seem to be the same! Can you explain why this is possible?

This puzzle is available as greeting cards from my online store.

A simple real life illusion: the transparent knife!

Have a look at the picture, it looks like a “transparent” or “camouflaged” knife! I took this photo during a magician party many years ago. This illusion is based on specular reflections, it is simple but effective… In fact, when you place the blade of a knife in the middle of the tines of a fork, it will reflect other objects that are nearby.

Image taken from my book “Optical Illusions: An Eye-Popping Extravaganza of Visual Tricks“, available from Amazon.
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Math-Magic Vanishing Space

Qaudrix puzzle 1

Inspired from the astrological tables, here is a new puzzle of my creation designed according to the ‘Golden Number Rules’, which is reflected in the proportion of each single piece of the game. Thanks to the balanced dimensions of its pieces, this puzzle acquires some intriguing magical properties!

This “math-magical” puzzle is composed of a tray in which the pieces are assembled.

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TangraMagic Puzzle

Tangramagic puzzle

TangraMagic, a new manipulative puzzle for classrooms or just for fun..

This unique puzzle of my creation  is ideal for teaching math basic skills, problem solving and critical thinking in an exciting way! The vanishing geometrical effects will hold juniors and seniors’ attention. All the secret of this game is concealed in two numbers: 5 and square root of 7.
Tangramagic puzzle 2

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