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Optical Illusions

Exhibit-Links
11798 Detail II

3D-Shadows

Shadows gain depth. Illuminated with red and green light, a tetrahedron casts a red and a green shadow on the screen. Viewed through glasses with red and…

10581 Illustration alt

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…

11747 Detail

Alike and unalike

The illusion of inequality. Two identical wooden arcs lie side by side. The inner one appears larger, but it isn’t. For circular arcs, the outer edge is…

11762 Detail

Ambiguous Figures

Clearly ambiguous. One object, two forms: “Necker cubes” belong to the category of ambiguously perceivable objects. Perceiving spatial dimensions and depth:…

10018 Haupt

Anti Gravity Mirror

Half a person becomes whole. Reflect the right half of the body, and there you have it: a complete person. It’s fascinating to watch them move. Can you manage…

10301 Haupt

Benham's Disc

Benham’s disks: seeing colors where there are none. The disks display patterns with black and white shapes. When these disks rotate, we perceive colors. When…

11763 11813 Detail I

Changing Sides

A wire cube rotates in front of a mirror. If you squint one eye and fix a front corner of the wire cube, you see a certain direction of rotation. If you now…

11559 Haupt

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…

10231 Haupt

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…

11744 Phänomen I

Crooked Tiles

Cafe Wall Illusion: the tile deception. These parallel lines really seem tilted! The black and white squares can be arranged in stripes or offset into a…

11837 1

Depth Enhancer

This exhibit is not accessible during the winter months. When you look at your surroundings through the depth enhancer, they seem quite unfamiliar. The depth…

11765 Detail

Dialog in the Vase

Vase with two faces. At some point, the image flips: first, it’s a vase. It rotates. Wait! There are two faces. Two people talking to each other. Two…

10158 Haupt

Disappearing Glass Rods

Brought before your eyes: Optical density. Similar to how a drinking straw appears bent in a glass – here is another way to illustrate the phenomenon of…

11477 Haupt

Distorted Room (Ames Room)

Little one grows tall. An absolutely ordinary room, at least when viewed through the peephole. But wait, the little brother grows taller than the big sister…

10116 Detail

Escher’s endless Staircase

Ascending downwards. Luckily, this infinite staircase doesn’t exist in our world. It leads upwards endlessly, without ever reaching a top. Similarly, its path…

10431 Detail

Floating Rings

Magical: Three rings floating in perfect balance. That they appear to balance like spinning coins is an illusion. The rings are firmly connected to one…

10493 1

Floating Tap

This exhibit is not accessible during the winter months. If this tap were not in the Technorama Park, it would probably have come from the land of milk and…

10427 Haupt

Hermann Grid and Scintillating Grid with Variants

A static image that flickers. Viewed from a certain distance, with a steady gaze, these images flicker. They scintillate. The Hermann grid seen up close: at…

11804 Detail

Hollow Head

Only has eyes for you. One step to the left, three to the right, stretch upward a little, bend down: there’s no escape. Those eyes follow you…

10535 Haupt

Impossible Nuts

A perfectly straight pencil that wiggles. When the brain resists what the eye sees: it seems impossible for the pencil to move through the two nuts in such a…

11756 Haupt

Inclined Chess

Big and bulky for some – small and slim for others. A completely messed-up chess set, right? Agreed? Almost. The chessboard is perfectly level. The pieces…

11015 Phänomen

Light Deformation

"Successioni luminose" – physics turned upside down. Light deforms metal: physical laws are seemingly – and visibly – turned on their head here. A white…

11760 Detail

Make two into one

A new look at familiar faces. Three of you are sitting at a table. One person is looking into two mirrors. With the right eye, they see the person sitting to…

10335 Haupt

Pinna illusion

Perceiving movement in a static image. Two concentric circles are made up of tilted rectangles, rotated in opposite directions. When approaching or stepping…

10343 Haupt

Pulfrich Phenomena

This pendulum circles. Through the optics, this pendulum swings in an elliptical path. With a gray filter in front of the other eye, its direction changes.…

10351 Detail

Real-Virtual, Virtual-Real

Image and/or reflection. In a bulging glass vessel illuminated from below, a small object hangs. Or are there two? The glass body behaves like a concave…

11802 Haupt

Reversed Perspective

Art gallery reveals contradictions. This three-dimensional spatial sculpture completely overturns our visual habits. It flips the space by presenting elements…

10597 Illustration alt

Shake Hands with Yourself

The concave mirror is shiny black: a red ball dangles invitingly, brightly lit. Set the ball swinging, then slowly reach to catch it. Your mirror-image hand…

11818 Phänomen I

Squaring the Circle

Everything always has two sides. From one side, it looks like a square; from the other, a circle. It’s all a matter of viewpoint and perspective. The…

10423 Detail

Squirming Palm

Rotating pattern and its afterimage. Stare at the rotating dot pattern for a while, then look at the palm of your hand: it now seems to rotate too – but in…

11792 Detail

Three Chairs

A different perspective: spatial perception. Looking through the peephole reveals three chairs. Only one is built as we would expect. A side view into the…

11815 Haupt

Three-dimensional Projection

3D – the cinema is made by the brain. From red and green shadows, plastic, three-dimensional objects emerge. Viewed through glasses with red and green…

10103 Phänomen

Touch the Spring!

Or maybe not? It appears incredibly real: a three-dimensional image – here a feather – reflected by a spherical mirror. Impossible to touch.

10227 Haupt

Touching the Knife (or not)

Ouch! A Swiss army knife floats freely in the air. Appearance and reality: no one gets cut by this knife. Reaching for it ends in thin air. What we see is…

11763 11813 Detail I

Turning Shadow

Playing with the Pulfrich effect: perceiving a two-dimensional image as three-dimensional. Through the Pulfrich glasses, the shadow of the cube gains depth.…

11797 Detail I

Waterfall Effect (Rotating Spirals)

Vision happens primarily in the brain. Spiral patterns seem to fold in and out as this disc rotates. If we focus on a stationary object, it suddenly appears…

10494 Detail

Waterfall Effect (Rotating Spirals)

Illusory motion, its direction, and afterimages. As the disc spins, the spiral patterns seem to turn inside out. Then, after focusing on the patterns for a…

10251 Haupt

Wheel of Life

Does our brain work like a film camera? Similar to a flipbook, an endless film plays here. The twelve tiny light dots are the main actors. Despite this sparse…

10867 Detail

«Poppier»

When walls wobble. Reversed perspective: it turns our visual habits upside down. The three-dimensional sculptural painting “Poppier” practically flips spaces…

Experiment-Links
Ambiguous Cube 2

Ambiguous Cube

Strange things can happen when your brain gets confused. Some objects or figures are “ambiguous,” providing visual input that your brain can interpret in more…

Anti Gravity Mirror DSC 6663 H1

Anti-Gravity Mirror

Learn how to fly with this neat mirror trick. A reflection of your right side can appear to be your left side. Try this activity and you'll appear to perform…

Benhams Disk Schablone

Benham's Disk

A rotating black-and-white disk produces the illusion of color. Rotate this black-and-white pattern at the right speed, and the pattern appears to contain…

Blind Spot Experiment Explo 2

Blind Spot

To see or not to see. The eye’s retina receives and reacts to incoming light and sends signals to the brain, allowing you to see. One part of the retina,…

Color Contrast Main

Color Contrast

A colored object may look different against different-colored backgrounds. In this investigation, you'll discover how colors seem to change when you place them…

Hole In Your Hand Main

Hole In Your Hand

What happened to your whole hand? You have two eyes, yet you see only one image of your environment. If your eyes receive conflicting information, what does…

Workshop-Links
Farbkreisel

Aus Rot und Grün wird ....) Farbmischung mit Kreiseln - inklusiv

bunte Papierscheiben tanzen. Plötzlich sehen wir Farben, die vorher gar nicht da waren. Wie kommt das? Und können wir mit nur drei Farben unsere…

Farbkreisel

Red and green make …? - colour mixing with spinning tops

Mixing colours differently: We build spinning tops and let colourful paper discs dance. Suddenly we see colours that weren't there before. How is that…

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Air

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Darstellen

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Interferenz

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Lichtstrahl

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Model

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Perspective

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Riddle

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Scientific method

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Water