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Science Snacks

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 many gravity-defying stunts.


Grade Bands: 
K-2
3-5
6-8
9-12
Subject: 
Biology
Neuroscience
Perception
Light, Color & Seeing
Physics
Light
Keywords: 
mirror
friend
exhibit-based
reflections
NGSS and EP&Cs: 
LS
LS1
PS
PS4
CCCs
Patterns
Cause and Effect

  • Facebook logo
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Tools and Materials

  • A good-quality flat plastic mirror, 2 × 3 feet (60 × 90 centimeters) or larger
  • A mirror stand (this can be anything that will support the mirror in an upright position and still allow someone to straddle it—for example, a ring stand or two with clamps and tape)
  • A partner

Assembly

Secure your mirror in an upright position. One way to do this is to tape a ring stand to the back of the mirror. You want the mirror to be as vertical as possible and leave enough room for someone to be able to stand with one foot in front of the mirror and one foot in back.


To Do and Notice

Stand the mirror on the floor. Have your partner stand facing the mirror.

Straddle the mirror by placing one leg in front and one leg behind. Shift your weight to the foot behind the mirror. Next, lower yourself so your torso is at the top edge of the mirror, then lift your front leg and move it repeatedly toward and away from the mirror. To an observer, you’ll appear to be flying.

If you use this Snack as a demonstration, you can make the effect more dramatic by covering the mirror with a cloth, straddling the mirror, and then dropping the cloth as you “take off.”


What’s Going On?

If you stand with the edge of a large mirror bisecting your body, you will appear whole to a person who’s observing from the front. To the observer, the mirror image of the visible half of your body looks exactly like the real half that is obscured behind the mirror. 

You look whole because the human body is symmetrical. The observer’s brain is tricked into believing that an image of your right side is really your left side. So just straddle the mirror, raise one leg, and you’ll fly!

You can try this out any place you find a good-sized mirror you can straddle or stand alongside—at home, in a department store, or in a dance studio with a doorway cut into a mirrored wall. Stand at the edge of the doorway so that half of your body is being reflected for a very convincing flight.


Going Further

The cars that floated across the desert in the movie Star Wars each had a full-length mirror attached along their lower edge, hiding the wheels. A camera pointed at a car saw a view of reflected sand and shadow in the mirror. That's how the cars appeared to float above the sand.


Resources

Check out some things you can do with your Anti-Gravity Mirror in this episode of the Build Your Own Exploratorium video series.



Related Snacks

Science activity that explores images from a concave mirror.
Touch the Spring

You can see it, but you can’t touch it.

Science activity demonstrating paths of light reflection
Corner Reflector

See yourself as others see you.

Cylindrical Mirror

See yourself as others see you in this cylindrical mirror.


Related Exhibits

Anti-Gravity Mirror
Anti-Gravity Mirror

Take off and fly in a mirror that makes half your body look whole.



Creative Commons License



This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

Attribution: Exploratorium Teacher Institute

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