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"Delta Phi"

by Joachim Sauter The chrome-plated surface of the exhibit resembles a strongly moving water surface. Illuminated from above with a torch, the incoming light…

2x2 Puzzle

Four cubes fit together in the box. Each cube has 4 quarter-pictures, one on each of 4 faces. The other two faces are transparent, BUT they look onto the…

3D-Shadows

A tetrahedron on the ceiling or visitors on a floor panel are illuminated by a red and green lamp and thus cast a red and green shadow on the screen behind…

847 Compass needles

There are 847 compass needles attached to a disc. Because they are so close together, they influence each other. With a magnet, the compass needles can be made…

A Slice of Turbulence

by Ned Kahn If the crest of the wave collapsed over the surfer off Hawaii and he could bring home a slice of salami from it, he would have the original to the…

Additive Color Mixing

Light colours are mixed quite differently from paint colours. We have known since childhood that many colours mixed together in a pot of paint produce a dark…

Adhesive Air

Air is blown through a large funnel. Stand in front of it, but you will hardly feel it. If you now push the funnel slightly backwards, you will suddenly feel…

Aeolian Landscape

by Ned Kahn Alongside water and ice, wind is the shaping element of the natural landscape. This exhibit allows for the pleasurable "terraforming" of gently…

After Image

Not seeing nothing, but seeing nothing! A strong flash of light triggers a photochemical process on our retina. However, this process lasts longer than the…

Air Bubbles

A pump can be used to force air into a water-filled glass tube. However, not all air bubbles rise vertically. Some do, others choose more of a zigzag or spiral…

Air cushion

Inventive talent is called for here! Use scissors and tape to build objects out of paper that float on the wide air cushion. While testing and optimising, you…

Air Fountain

This exhibit is not accessible during the winter months. by Daniel Wurtzel A large kinetic sculpture with lots of air. Air flows from the side of a round,…

Air lift

A hole in the middle of the table, a tube open at both ends in the hole and a fan in front of it. In this tube there is a free-moving ball that is secured…

Air Mirror

Sit comfortably and check the stripy view at the end of the road. Now heat up the road. (A solid steel plate rapidly heats to 100°, warming the dark sand of…

Alike and unalike

Two identical sheets of wood are placed next to each other and compared. Since the perceptual system in the brain cannot perceive things in isolation, you see…

All Triangels are the same

Using different triangular shapes, congruent shadows are to be cast on a pattern wall with equilateral triangles.

Ambiguous Figures

The cubes, called "Necker cubes", belong to the ambiguously perceptible objects.We can see the cube differently in the same physical position - front and back…

Anamorphic Images: Cone

On a flat surface the images are distorted beyond recognition – a peculiar visual code requiring a special key. Slip the square sheets over the reflective…

Anamorphic Images: Cylinder

On a flat surface, the images are distorted beyond recognition - a special visual code needs a special key. Put the square panels over the reflective cylinder:…

Angled Mirrors

With two mirrors that can be brought to different angles to each other around an axis, polygons (so-called polygons) can be made in a simple way. At very…

Anti Gravity Mirror

This mirror construction turns a "half-observer" back into a seemingly complete one, makes one float in space or makes one grow additional pairs of arms or…

Ascending magma

by Ned Kahn No, it is not real magma, but this model magma nevertheless makes it clear to us what processes are going on deep under a volcanic vent. Air is…

Aurora

A strange "mirror" distorts points of light into long, luminous bands, comparable to the interplay of water and light when the sun rises. Why don't you just…

Back View

Step forward to check how neat (or not….) your bum really looks in those cool new jeans: every clothes’ store should have this back-view booth!