Function and construction

Logic

Mathematics

Mechanics

Puzzle

Shape and Space

Technology and design

"Delta Phi"

Optical phenomenon: caustics. The surface of this object resembles that of moving water. Illuminated from above, it reflects incoming light rays in various…

847 Compass needles

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

A riddle for intelligent and patient people

Puzzles for the sharp-minded and patient. Trickier than it seems: these eleven puzzles with strings, boards, and rings are challenging. One of them cannot be…

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…

All Triangels are the same

Central projection: Using various triangular shapes to cast congruent shadows onto a patterned wall with equilateral triangles.

Angled Mirrors

Many polygons. Two mirrors positioned around an axis at various angles: a simple way to create shapes with many sides (polygons). At certain angles,…

Aurora

A different kind of reflection. Colored filters in a mirror: why don’t we simply see their exact image? The surface of the mirror is rough. Restless,…

Ball in a Bowl

Shorter path = faster to the goal? A question that occupied the best mathematicians three hundred years ago. This competition compares two parallel tracks,…

Ball sorting machine

Playful tidying up. Yellow. Red. Blue. This machine sorts the small, medium, and large balls among Pierre Andrès' “Machines Singulières” in a playful manner.…

Banana

If you place a blue filter exactly on the yellow banana, the banana appears green - logical, isn't it? A larger blue filter that also covers the white…

Beam Bridge

The simplest form, but not the most stable. This bridge demonstrates the forces acting on a straight beam when it is loaded and supported only at its two…

Bouncing (Steel) Ball

Ping-ping, not ping-pong. When a ping-pong ball drops onto the table, its sound is unmistakable. A tapping noise that grows quicker and quicker. This happens…

Break the code

Qxpoa gvp pbuu: Cryptography. An encrypted text appears on the monitor. The challenge is to decrypt it with as few errors as possible. But there are over four…

Bridge the Gap

Building bridges is not so easy - especially when you are not allowed to use nails, screws or glue! Here you only have nine identical wooden blocks at your…

Cartesian Diver

Sinks / Doesn’t Sink Sometimes called a “Cartesian diver,” this hollow body is partially filled with water and air. Depending on the pressure in the liquid,…

Catenary Arch

Building solid – like the Romans. An arch as a delicate structure: reconstructing what the Romans perfected. Understanding what gives their elegant arches…

Chance Happenings

Capturing randomness – with dice. Four faces of these dice are white. The other two faces show a red circle. After each roll, the dice with the red circle…

Changeable Weather

How do you determine the average value of numerous individual measurements? Here, the average monthly rainfall can be determined experimentally.

Chaotic Pendulum

Momentum and Joint A long, light pendulum connected to a small but heavy pendulum. A push on the knob sets the entire system in motion. The effect on the…

Chaotic Pendulum II

Momentum and Reversal Three smaller pendulums attached to a large rotating arm. A push on the knob sets the entire system in motion. The effect on the three…

Christmas Balls

Round shapes, angular gaps. The spheres are indeed round, despite the triangular gaps between them. Can this really be? If a sphere is missing in the…

Circular Deformations

Geometric shapes come to life. What we think we see in the shapes of spinning discs! Ovals wrapping around stationary circles. Cones wobbling in a…

Circular Deformations

Patterns come to life. Ovals form around stationary circles. Funnels emerge, cones rise. Curved lines perform a serpentine dance. Images that, when observed…

Color Contrast

How blue blue can be. Two color squares, one lighter, one darker. Are we sure? As different as we perceive them, they actually share the same color. We…