Algumas ilusões ópticas

Beautiful scene. But there is something more to it.

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It is quite interesting that all numbers can be created by using only two numerals - 4 and 8.

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1st Color Blindness Test - can you see a "12" on this plate?

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2nd Color Blindness Test - there is a "26" on this plate.

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3rd Color Blindness Test - can you trace a line from one "X" to the other?

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4th Color Blindness Test - you should see 58 (upper left), 18 (upper right), E (lower left) and 17 (lower right).

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There is nothing moving on the picture. (© Akiyoshi Kitaoka: Used with permission.)

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Another static picture. (© Akiyoshi Kitaoka: Used with permission.)

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Motion is just an eye illusion. (© Akiyoshi Kitaoka: Used with permission.)

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There is nothing moving below. (© Akiyoshi Kitaoka: Used with permission.)

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Boats on the picture are not moving. It's just an eye illusion. (© Akiyoshi Kitaoka: Used with permission.)

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Who do you like more - women or saxophone players?

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Are there really just flowers?

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Is this really a spiral?

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Are the horizontal lines parallel? (of course they are)

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If you can read the following picture, then you can shout ...

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You may read across and upright.
A-B-C or 12-13-14?

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This impossible object is called "Devil's Fork" or "Schuster's Conundrum" (by D. H. Schuster)

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Given the wood do you think you could make this?

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Or this one?

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A realistic photo?

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Try to arrange dices like this.

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Another interesting building.