People will see a set of keys through your hand!

You can make a set of keys appear to pass through your arm or hand. The Pulfrich illusion, visual sampling rates, and fusions from persistence of vision explain the effect.

You need to create a difference in the light intensities entering the viewers' eyes. The safest way to create the intensity difference uses filters, such as one lens from sunglasses. Viewers wear the lens over one eye while looking with both eyes. The viewers should be seated in a stationary chair because differences in light intensities in each of the eyes will produce depth distortions.

Make a pendulum using shoelaces or string and a set of keys. Swing the keys in a single plane, back and forth in front of you. Two-thirds of people will see the keys moving in an elliptical pattern. The direction of movement of the keys through the elliptical pattern is predictable. With less intense light entering the left eye than the right eye, the keys will appear to swing in a clockwise direction. With less intense light entering the right eye than the left eye, the keys will appear to swing in a counterclockwise (or anticlockwise) direction.

Following the instructions to this point, you will have created a version of the Pulfrich illusion. Pulfrich, for whom the effect is named, and his assistant Fertsch, sought explanations for problems in the use of range finder telescopes, stereocomparators, and other stereo viewing devices. The devices were perfectly aligned by physical measurement, but usage problems appeared. The pair of investigators traced the usage problems to intensity differences of light entering the two eyes. Pulfrich never experienced the illusion named for him because he was a monocular viewer.

You can create many variations of the Pulfrich illusion. For instance, view a 'snowy' television screen with filtering and the snowy dots on the screen will appear to move around a cylindrical pattern. You can also use a low intensity light source, such as a flashlight, to add light to one eye rather than filtering one eye. BE CAREFUL NOT TO SHINE HIGH INTENSITY LIGHTS INTO YOUR OR OTHERS' EYES!

To create the illusion of keys passing through your hand, allow people to view the Pulfrich illusion for a couple of minutes. Over this time, many people report that the effect increases in strength. Then time the movement of your hand from your body, obliquely toward the plane of pendulum movement, so that your hand arrives just behind the plane of pendulum movement just prior to the keys passing in front of your hand. Withdraw your hand back toward your body and repeatedly advance your hand in timing with the swing of the pendulum. To most viewers, the keys will appear to pass right through your hand or arm. The place on your body that the keys appear to pass though will be determined by the strength of the illusion that you have created for your viewers.

You may be able to see the Pulfrich illusion by using
a filter and viewing the stimulus above. Remember that
the illusion requires time to build strength, that
only 2/3 of people will see the illusion, and that computer
systems differ greatly.
  • What accounts for differences in strengths of the illusion?
  • What explains some people seeing the illusions and other not seeing them?
  • Can you develop 3-D displays of xray photos, movies, television, etc. without requiring viewers to use special glasses or filters?

This entry was posted in , , , . Bookmark the permalink.

2 Responses to People will see a set of keys through your hand!

Anonymous said...

I congratulate, your idea is useful

Anonymous said...

I will know, I thank for the information.

Leave a reply

Thanks for your Comment, keep on leaving comments...


3D Art Adds Illusion Advertisement Aeroplane Album Cover Alphabets Amazing Art Anamorphic Angry Animals Animation Aquarium Architecture Argentina Arrow Art Artist Attention Awareness Axe Towel Bag Balancing Balcony Ball Bathroom Batman Beans Beautiful Bed Sheet Bezold BiCycle Bikini Billie Joe Armstrong Binocular Birds Black Block Boat Box Brain Brightness Building Bunny Butterfly Calm Camera Car Casino Cat Celebrities Optical Illusion Celebrity Chair Charlie Chaplin Circle City Clockwise Clothes Cloud Coca Cola Color Colour Computer Confusing Sign Couple Cow Cowboy Creative Crocodile Cube Curved Dancing Death Design Devil Diamonds Dices Dick Digital Dimensional Dizzle Dog Dolphin Dot Dragon Drawing Drinking Drunked Duck Earthquake Edges Effect Einstein Mask Elephant Elisabeth Expansion Extreme Eyes Face Falling Festival Fire Fish Flag Flexible Floating Floor Flowers Flowing Flying Focus Fountain Freeze Friends Frown Fruit Funny Gadget Game Garden Ghost Girl Glass Glowing Google Earth Gorilla Graphics Great Guitar Hand Hat Head Heart Helicopter Hidden Object Horizontal Horror Horse Hot Hotel Illusion Impossible Interesting Invisible Istvan Orosz Jauria Jesus Joshua Callaghan Julian Beever Lady Language Laptop Lava Leaning Leaves Life Lift Lifting Object Illusion Light Lines Links Lion Love Magazine Magic Man Mastaches Memories Michael Jackson Mirror Monalisa Money Moniter Moon Motion Motorbike Mountain Moving Music Mysterious Island Naked Name Nature Naughty Night Numbers Old man Opposite Optical Illusion painted illusion Painting Pandas Parallel Paris People Photography Pictures Planets Possible Prongs Puzzle Queen Queen Elizabeth Radiations Random Reading Rectangle Reflection Restaurant Ring Rocket Romantic Roof Rotating Sand Scary Scary Optical Illusions School Screen Sculpture Seconds Sense Sex Sexy Sexy Lingerie Shadow Shampian Shigeo Fukuda Simultaneous Singer Size Skeleton Sketches Skull Sleeping Smoke Snail Snakes Soccer ball Soldier Soul Spider Spinning Spiral Spitting Square Star Statue Statue of Liberty Stitches Strange Street Structure Style Sun Swelling Swimming Pool Taj Mahal Taller Tattoo Designs Test Tigers Tobacco Toilet Top Tower Tracking Transparent Tree Triangle Trick Truck Unbelievable University Unusual Image Upside Down Upstairs Valentine Day Special Vampire Vehicle Videos Virgin Mary Visual Water Waterfall Watermelons Waving Weird Wheel Whirlpool Wildlife Window Wine Wolf Wolves Women Wood Words World World Map Zebra
Related Posts Plugin for WordPress, Blogger...