00:00Look who it is, the one and only Timothée Chalamet.
00:04Two things we know about his appearance.
00:06He has an incalculable number of shoes in New York,
00:09and he has androgynous beauty.
00:11Do you want to see the proof?
00:13Very well.
00:14Let's get closer to his face and focus on his eyes,
00:17his nose and his mouth.
00:19Now, let's erase his beard and duplicate this image.
00:22On the left side, we will increase the contrast between his eyes,
00:26his lips and the rest of his face.
00:28On the right side, we will do the opposite by reducing the contrast.
00:31Do you see a difference?
00:33Does Timothée look more feminine or more masculine in one of the photos?
00:37According to a researcher named Richard Russell,
00:40facial contrasts significantly contribute to our perception of masculine and feminine faces.
00:45Feminine faces tend to be more attractive when their facial contrast is reinforced,
00:51while masculine faces are perceived as more attractive when their contrast is reduced.
00:56And if I told you that Margot Robbie could be in the same room as you in just a few seconds,
01:02believe me, you just have to focus on the red dot in the middle of this scary image.
01:07In a moment, but not yet,
01:09I will ask you to look at your ceiling and blink very quickly.
01:13Keep looking and you will see Margot Robbie just above you.
01:17Just wait a little longer and go!
01:20Look at your ceiling and start blinking.
01:23Have you seen Margot?
01:24If so, let us know in the comments below.
01:27Optical illusions surround us, much more than we realize.
01:31Think of these 3D crazy and viral advertising boards,
01:35which give the impression that products, animals and other things are jumping right in front of our eyes.
01:41What is really strange about them is that we see these 3D images,
01:46but we do not need these eccentric 3D glasses with red and blue glasses.
01:51The secret behind this trick resides in a well-known optical illusion called forced perspective.
01:56Yes, it is the same technique that tourists use when they want to take this classic photo where they seem to support the Tower of Pisa.
02:04Please do not do it.
02:06What happens is that our eyes, which are slightly separated,
02:09see each other in a different angle, what is called binocular disparity.
02:14Our brains then combine these points of view to create depth in the images we see every day.
02:19Thus, 3D display panels try to copy this.
02:23This is why they always have curved screens with two faces.
02:26In this way, animators can present similar images
02:30from slightly different angles on each screen to create a 3D illusion.
02:35It's strange.
02:37Here is half of Anya Taylor-Joy and half of Beyoncé.
02:41But were their photos taken face or profile?
02:46The correct answer is face, since they both look directly at the lens.
02:51However, because the photos are cut in profile silhouettes,
02:54we really have the impression that they are sideways.
02:57Do you want to make things even stranger?
03:00Let's mask the photos and leave only two black silhouettes.
03:03Now, what do you see?
03:05Two people looking at each other.
03:07Or a vase in the middle.
03:09This is a classic optical illusion called the Rubin vase.
03:13It was created around 1915 and is a famous example of ambiguous images.
03:19Everything depends on the way our brains interpret the contours and the context of the image.
03:24If the context is black, you will see two people.
03:28If the context is yellow, you will see the vase.
03:31But there is no good or bad here.
03:34Keep fixing the central cross.
03:36I know, I know, this image is disgusting, a little literally.
03:41But you got this far in the video, so don't stop now.
03:45Focus a little more on the cross.
03:47On the count of three, we will replace it with a photo of Shakira.
03:50Ready?
03:51One, two, three.
03:53And, wow, okay.
03:55Shakira's hips don't lie, but they move completely.
03:59This movement makes no sense since it is a static image.
04:02So what's going on?
04:04This phenomenon is known as the illusion of the waterfall.
04:07It is essentially a consecutive effect of the movement that occurs when you look at a stationary object
04:12after having fixed something moving in a direction for a certain time.
04:17The name comes from the same experience you feel
04:20after observing water in a waterfall moving in a direction for a few seconds.
04:25When you fix something moving in a direction like the water of a waterfall,
04:29the motion sensors of your brain focus on this downward movement.
04:34But after looking at it for a while,
04:36these neurons get a little tired of seeing the same downward movement
04:40and become less sensitive to it.
04:43Thus, when you finally look away,
04:46the neurons for the opposite movement, in this case upwards,
04:50suddenly seem to be more active in comparison.
04:54A similar phenomenon occurs here.
04:56Look at this dove.
04:58Even if the sky is red and seems a little weird,
05:01the dove is pure white.
05:03But keep fixing it and something strange will happen.
05:06In a few seconds, we will change the sky to white
05:09and the dove will look strange.
05:11Are you ready? Let's go!
05:13Boom!
05:14If you see what I see, the dove now seems to be red,
05:17more like a pale version of the red of the original background.
05:20This effect is called a positive remaining image.
05:24And you want to see something even more impressive?
05:27If we continue to alternate quickly between the two images,
05:30the effect becomes even stronger.
05:32Can you see it?
05:34Look at this point here.
05:36This illusion is known as the walking foot.
05:39And you will understand why it bears this name in just a few seconds.
05:43What you see here are two feet,
05:45one blue and the other yellow,
05:47moving fluidly and quickly on a horizontal line.
05:51Now, let's see what happens when we change this unified gray background
05:55by adding vertical stripes to the screen.
05:58Notice how we have the impression that the feet are taking small steps.
06:01One at a time, right?
06:03So, why does this happen?
06:05It's all a matter of contrast.
06:07When the blue foot passes on the white stripes,
06:10the dark blue against the bright white stands out,
06:13giving the impression that it moves faster.
06:15But when it crosses the black stripes,
06:17the contrast decreases,
06:19which makes it seem to slow down.
06:21The yellow foot does the opposite.
06:23It seems faster on the black and slower on the white.
06:26Now, if we remove the stripes,
06:28there is no more contrast change to alter our perception,
06:32and the illusion disappears.
06:34This optical illusion is the last on our list.
06:37And there is a good reason for that.
06:39It can have effects that last a long time,
06:42like hours, weeks,
06:44and some people have even declared effects for almost three months.
06:48So, are you ready?
06:50Close your eyes for a moment.
06:52Perfect. Now, open them.
06:54Look at this image and continue to fix your gaze.
06:57At first glance, it looks like a set of stripes,
07:00both horizontal and vertical, in the background.
07:03But these are not just any black lines.
07:06If you want to feel the lasting effects,
07:08you have to look at it for at least three minutes.
07:11So, if you feel brave,
07:13do not hesitate to pause the video to set a timer.
07:16Next step.
07:17Look at this red image.
07:19Focus on it.
07:20Once again, for the effect to last longer,
07:23you should look at it for about a minute and a half.
07:26Do not hesitate to pause the video
07:28to be able to fix it longer.
07:30Now, we have this green image,
07:32which is very similar to red.
07:34Keep looking at it.
07:35If you want to test its maximum power,
07:38to put it that way,
07:39pause the video and look at it for a minute and a half.
07:42Great.
07:43We now come to the grand finale.
07:45Here we are back at the starting point with the image in black and white.
07:49If the effect worked for you,
07:51you could see red and green shades in this image this time.
07:54But we promise you,
07:56we have not brought any color change.
07:58Everything is in your mind.
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