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Description Presented here is a vast gallery of many different forms of Optical Illusions. Whether these optical illusions are conveyed through fractals, photographs, architecture, art, or old fashioned pen and ink, they are bound to remind you that "seeing is not believing."

Caution!!!! Some of the optical illusions on this blog may cause dizziness or possibly epileptic seizures. The latter happens when the brain can't handle the conflicting information from your two eyes. If you start feeling unwell when using this website, immediately cover one eye with your hand and then leave the page. Do not close your eyes because that can make the attack worse.
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Jastrow Size Optical Illusion

The Jastrow illusion is an optical illusion discovered by the American psychologist Joseph Jastrow in 1889. In this image, the two figures are identical, although the bottom one appears to be larger.

Jastrow Size Optical Illusion

So you look at the above and say OK maybe they are the same size. You can even see that it is true. How about the photo below, is it possible that these two are the same size?

Three Cubes Optical Illusion

Even knowing that the two above are the same size it is hard to believe. Look at them how is it possible for them to be the same size? Well you don't have to take my word for it, check out the video below. This time Seeing is believing!

Filmed at the Hong Kong Science Museum by YouTube.com user kennsiu.


Smiley said...


Anonymous said...

Anyone care to explain how this works?

Todd said...

I would also like to know that.

Is it the angles on the left and right sides of the pieces?

Anonymous said...

Dont believe it....!!!!

Walt said...

If you don't believe it, cut out your own pieces out of cardboard and see if it looks the same.

Simon said...

I learned this one by using a paper plate and cutting the pieces the same size. The illusion is created because the long curved side being next to the short curved side.

Mikami said...

Thats pretty cool.

con jones said...

i had this illution once... i was 5 when i got my first scalextric set.. i noticed that 1 track was bigger then the other...i was wondering,"how come its bigger"i just ignored it!

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