Posts Tagged ‘optical’

Stare at this animation for 40 seconds, and concentrate on the black spot. After some time, the image will switch automatically (since it’s 2 frame animation), and show you black and white photo of a Pyramid in Egypt. Because of the special effect, originally invented by John Shadowsky, you will see a full color photo of the Pyramid instead black and white one that shows up. Don’t believe me? See for your self! These kind of illusions became really popular in last few months. You can even find few of them in this site’s Archives. Check Rainbow Illusion, and Black and White Spanish Castle Illusion. Here’s what Felice Lungo, creator of this submission wrote in his email: “I made a “Black&White in Color Image” and I would be really glad if you can add it on your website! I don’t know if it’s possible!, but I hope! Hope you like it!”

After succesfull “Find your Blind Spot Illusion”, Mighty Optical Illusions brings you another cool test. Color blindness, also known as daltonism, is a deficiency in the view of certain colors. Red/green color distortion is the most common type of color vision impairment. In a few very rare cases, some people can only see in black and white shades. Color blindness is almost always an inherited condition although males are more likely than females to get it. Symptoms are inability to distinguish colors (usually red/green and sometimes yellow/blue).Click on the image below to open it in full size. You should see numbers inside the circles. If you aren’t color blind, you will see correct numbers (results are written next to circles so you can check them).

The photo below to the right shows an example of someone who confuses red and green. To such a person, reds and greens are indistinguishable and may appear the same.

Normal Vision
A Person Who Confuses Red and Green

Look at the chart below and quickly say the color, not the word. This prooves how our brain uses each side of the brain for different action: your right side of the brain want’s you to say the color, but the left side insists on reading the word!


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Lift Word Illusion

Man Landing on Moon IllusionSmoking Illusion

Impossible Staircase of Squares

Bezold Effect Illusion

The Bezold Effect is an optical illusion, named after a German professor of eteorology, Wilhelm von Bezold, who discovered that a color may appear different depending on its relation to adjacent colors. In the above example, the red seems lighter combined with the white, and darker combined with the black.

Can you tell whether it`s going clockwise or anticlockwise?

Rotating Star Illusion


3d cube colour illusion

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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?

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Waving Dots Motion Illusion

White Arror Exits Illusion

Duracell Battery IllusionDid you notice that it`s a painting on a bus?

Look at closely both the image and find the empty block where it is gone

Read it carefully other wise you will definately get confusion in the Image while reading

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Illusion How many colours can you see in this illusion?   Answer: Only 2!

Illusion What can you see?

Answer: LIFT


A cube in a room or a cube with a bit missing?


Same colour orange?

Answer: Both colours are the same!

Illusion Impossible shelf


Are the middle circles both the same size? Answer: Yes!

Illusion Interesting escalator!

IllusionThey`re the same length!


Are the two balls really at the same level?

Answer: Yes


Lots of very odd perspectives. Created by William Hogarth in 1753. So Cool!


Stare at the image for 60 seconds and then move your mouse over the bar below. You should see an interesting afterglow.


Is the water flowing uphill in this impossible Escher type waterfall?


Are the squares A and B the same colour?

Answer: Yes!

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