What Do You Sea

2021-12-03 19:44:00 Adelson's Checker-Shadow Illusion

When you see the above, ask yourself: Which square is brighter, the one denoted by "A" or "B"? If you’re like me, "B" looks brighter.

However, as you can see when they are covered with yellow figure - you can clearly see that they are the same. Also, for your convenience, in the end of the video the square A is moved and reveal its true luminance out of the “shadow”

In fact, the two squares - A and B have identical luminance (identical number of photons coming out from them). But our eyes are no exposure meters, they take context into account.

#classic

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2021-12-03 07:54:19 She is Gonna Die

This is a rare type of illusion where without any special video effects, without editions, the video looks not what it is.

Share your thoughts in the comments!

#fun

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2021-12-02 19:43:00 Can You Spot the Difference?

This is not an illusion, however the well-known "spot the difference" game to power up your mind for today ;-)

Did you find the difference?

Would you like more of such posts here, or you prefer only illusions?

#fun

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2021-12-02 07:16:19 Spiral Aftereffect

Gaze at the center of the rotating spiral for about 20 seconds, then look elsewhere. You will notice that whatever you look at now appears swirling. Don’t worry, it won’t stick ;-), this sensation will go away after a few seconds.

Gazing at the spiral for a longer time will increase the duration of the aftereffect, leveling out at ≈ 30 s. Holding the gaze steady at the center (don’t over-concentrate, “let it hang”) also increases the effect.

The basic phenomeon is called “motion aftereffect”. How do you feel after it?

#classic

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2021-12-01 19:59:56 Hidden Word And ...

This image contains two elements. Let's see who can see them both and read the hidden word. Comment your answers below!

#fun

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2021-12-01 09:21:30 Induced Contrast Asynchrony

There are two disks, pulsating between dark and light. Are they doing this simultaneously? If you contine watching, you will notice that this depends on the background. If it is light, the two disks are in synchrony. However, when one background is dark and the other light, they pulsate with opposite phase.

#classic

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2021-11-30 20:59:00 Find the Difference

This is one of the most hard riddles. 96% of all people just give up, and that's why it was nominated for the Guiness World Records Book.

Did you find the difference?

P.S. the answer will be shared after 150 comments ;-)

#fun

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2021-11-30 07:12:12 Stroboscopic Alternative Motion (SAM)

In the video there are 2 blue dots which continuosly change position. Decide for yourself: are they moving (hopping) horizontally, vertically, or (counter-) clockwise?

If you see them moving horizontally, cover the left two positions with your hand. Now they are moving vertically. If you see them moving vertically, cover the bottom two positions with your hand and observe.

You even may be able to perceive a rotation, clockwise or counter-clockwise (like a propeller).

But what is the “real motion” of the discs? - Answer in comments, and I will share the correct one after 100 comments.

#classic

@WhatDoYouSea Open / Comment

2021-11-29 19:23:45 An Image is Worth of Thousands Words

So just share in comments if you realized how many people actually there, and what do you see ;-)

#fun

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