00:00And yes, it's the face of Kim Kardashian, at least technically.
00:05I understand, it's hard to believe.
00:07How can someone so glamorous seem so strange?
00:11Take a moment to think about what's going on here.
00:15And let's see if your mind can elucidate what your eyes don't seem to be able to grasp.
00:21We should really try with other famous figures.
00:24But let me first explain the principle to you.
00:27You have just seen the fascinating illusion known as the reverse effect of the face.
00:33Discovery.
00:3445 years ago, this illusion continued to surprise and amaze the public.
00:39Here is how it works.
00:40The image is reversed.
00:42But some very essential elements of the face, such as the eyes and the mouth,
00:45retain their usual orientation.
00:47For the illusion to be effective, it is crucial to modify only these key elements.
00:52This discovery highlights a flaw in the way our brain treats faces.
00:57Rather than perceiving them as a whole,
00:59we analyze each component individually before reconstructing the whole.
01:04Now let's take a look at Lady Gaga.
01:06While you watch her, try to understand what's going on here.
01:10Admit that it's rather hilarious.
01:12Wait, is it Ariana Grande?
01:14To be honest, she is unrecognizable.
01:16Such a funny illusion would well deserve its own Instagram filter.
01:20Anyway, it's time to really explain to you what it's all about.
01:24I have a fascinating experience to offer you.
01:27Look at this image for a moment.
01:30Notice what happens with the contours?
01:33They seem to fade away, disappearing as if by enchantment.
01:36Then, as if by magic, the empty areas take on a greenish hue.
01:40This amazing visual effect is known as the Troxler effect.
01:44When you stare at a point for too long, your brain begins to ignore what surrounds it.
01:49In a way, it decides that nothing new is happening in this place
01:53and keeps an eye on it for a few moments.
01:55Thus, while you think you are observing the image as a whole,
01:59your brain silently eliminates the details it considers uninteresting.
02:04Trust me on this.
02:06If you keep looking at these black and white points for a long time,
02:10something, or rather someone, will eventually appear.
02:13Here's a clue.
02:14This person is a singer, young and of great beauty.
02:18So, have you guessed who it is?
02:21It's Lana Del Rey, ladies and gentlemen.
02:24You just have to adjust your gaze to distinguish the silhouette behind all these visual distractions.
02:30There you go, the trick is done.
02:33Here's an intriguing scene.
02:35Shakira and Miley Cyrus gathered in the same room.
02:38But why does Shakira seem so huge, while Miley seems tiny?
02:43In reality, Miley, with her 1.65m, is taller than Shakira, who only measures 1.57m.
02:50I'll leave you for a few moments to try to solve this riddle.
02:54This is a classic optical illusion.
02:56If you have ever visited a children's museum,
02:59it is likely that you have seen one of its installations, the famous Ames Chamber.
03:04This device creates a total distortion of perception.
03:07Let's take a look behind the scenes.
03:09The Ames Chamber is designed with a floor and an inclined ceiling,
03:13transforming the room into a kind of trapeze.
03:15When you look at it, your eyes are deceived,
03:18giving you the illusion that the two sides of the room are identical.
03:21But this is not the case.
03:23It all depends on how your eyes interpret the depth.
03:26A person moving to the left of the room is actually further away,
03:30with a higher ceiling, which gives the impression that it is shrinking.
03:33Conversely, when it is on the right, it seems much larger.
03:38Look carefully at this staircase.
03:41It seems ordinary, doesn't it?
03:43Now, let's turn it over.
03:45It keeps the appearance of a staircase.
03:47But instead of going from right to left,
03:49it now seems to go from left to right.
03:52The secret to maintaining this illusion is simple.
03:55Do not blink your eyes.
03:59If you do, the illusion will disappear instantly,
04:03and the original image will reappear.
04:05This fascinating illusion is called the Schröder staircase.
04:08Although it seems simple at first glance,
04:11it highlights fundamental aspects of the functioning of our brain.
04:15By breaking down this staircase,
04:17we discover that it is actually flat.
04:19What your brain perceives as a three-dimensional structure
04:22results only from a subtle play of shadows and light.
04:26This 3D effect is therefore nothing more than a skillful optical illusion.
04:30Our brain, used to interpreting images
04:32according to our past experiences,
04:34detects a shadow in a 2D image,
04:37fills in the gaps,
04:38and projects an impression of non-existent depth.
04:41Here, it makes us believe in a three-dimensional perspective.
04:45Impressive, isn't it?
04:46Wait a moment.
04:47You don't need any special equipment
04:49to understand what's going on with Adele's face.
04:52Just focus your gaze on the little white dot
04:55located in the center of the image.
04:57I'll tell you when you can turn your eyes away.
05:00Take the time to look closely at her face.
05:03We need your full attention for a few seconds.
05:06When I say,
05:07go,
05:08fix a white wall or a sheet of blank paper.
05:11Ready?
05:123,
05:132,
05:141.
05:15Now.
05:16It's crazy, isn't it?
05:17This phenomenon is known as the illusion of the remaining negative image.
05:22First, you look at an image with inverted colors for a few moments.
05:26Then, by looking at a white surface,
05:29the original image appears,
05:31in this case,
05:32Adele's face.
05:33It seems magical,
05:34but let me explain to you
05:36why this phenomenon is based on scientific basis.
05:39This phenomenon is explained by the fascination of your eyes
05:42and your brain for contrast.
05:44When they are exposed to opposite colors,
05:47they try to restore the balance by reconstituting the correct shades.
05:51Thus, even if the screen is empty,
05:53your mind, like an artist,
05:55imagines and paints the appropriate shades.
05:58Another image with black and white bars,
06:01which is hidden below this time.
06:03Keep watching and you will discover it.
06:07Think of the word baby,
06:08repeated several times,
06:10accompanied by a funky melody.
06:12Did you recognize it?
06:13Yes, it was Shiran.
06:15Ready to blur the tracks?
06:17Look at this very popular optical illusion.
06:20Fix it for a few seconds without moving your eyes.
06:22Do you see something strange?
06:24It is a grid with a broken edge.
06:27If you focus your gaze on the center of the image,
06:30these edges seem to be repaired as if by magic in your peripheral vision.
06:34Your brain, irresistibly attracted by the patterns,
06:37cannot help but recreate them.
06:40This illusion, imagined by Ryota Kanai,
06:42was even a finalist in the contest of the best illusion of the year in 2005.
06:47Kanai explains himself that it illustrates the natural attraction of our visual brain
06:51for regular patterns.
06:53You like snakes, don't you?
06:55These are not scary at all,
06:57and you could watch them twirl all day.
07:00In which direction do they seem to go?
07:02By the way, do they really move?
07:05It may surprise you, but these snakes do not move at all.
07:09The illusion is based on repeated asymmetrical patterns
07:12and combinations of ingenious colors.
07:14Light colors like yellow and white
07:16mix with blues and blacks,
07:18darker,
07:19creating an effect that deceives the retina.
07:22Your brain then receives signals
07:24that give the impression that these circles are moving.
07:27Do you want to pierce the illusion?
07:29Fix your gaze on a single point in the image.
07:31By continuing to do so,
07:33you will see these circles slow down and move.
07:36Ingenious, isn't it?
07:37Let's move on to the last illusion,
07:39and if it fails to deceive your brain,
07:41I surrender.
07:43Look at this photo.
07:44It is in black and white, isn't it?
07:46Take the time to think.
07:48Your brain is probably trying to show you colors,
07:51but don't let it fool you.
07:53What you are looking at is a black and white image
07:56on which are superimposed lines of green,
07:59red,
08:00orange,
08:01yellow and blue.
08:02This saturated gray creates the illusion
08:05that the gray parts are colored.
08:07But to dissipate this illusion,
08:09you just have to zoom in.
08:11You will then see the real colors of the original image.
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