00:00Are you able to read between the lines, or to unravel something to hide in images of anodine appearance?
00:06Let's take the first illustration.
00:08Do you see a feminine silhouette, or the word, hope?
00:12Both are valid, and it is fascinating to see that some first perceive the woman, then the word,
00:18while for others, it is the opposite.
00:21Another intriguing aspect of this illusion lies in the perfect alignment of the letters that make up hope.
00:27Although the background leads your brain to believe that they are inclined.
00:31Extending the observation of this image could tire your eyes, so let's move on to the next one.
00:36What colors are the balls you see here?
00:39I have the clear impression of seeing blue, red and green.
00:43If this is also your case, we make both mistakes.
00:46In reality, all the balls are of the same shade of brown.
00:50The lines arranged in front and between them deceive the brain by giving it the illusion of multiple colors.
00:57Well, let's look at what is going on here.
01:00At first glance, it seems to be a simple degraded square, but it could well be a surprise.
01:06Do you have the impression that this square is moving?
01:08This should not be the case, because the image is perfectly stable.
01:12This illusion recalls the magic of some 3D patterns.
01:17I mainly use ChatGPT to find ideas for dinner when I lack inspiration.
01:21But a Reddit user recently asked her to imagine a color still unknown to man.
01:27I doubt that we can truly speak of a color in the strict sense.
01:31It is rather a conceptual interpretation of what such a color could be.
01:36Those who have tried to perceive something have reported strange phenomena.
01:40This is similar to one of these optical illusions where you have to fix the image.
01:44After observing it for a moment, did you also distinguish the word woman or just me?
01:52Here is another creation of ChatGPT.
01:55The composition of the shapes and dark and luminous nuances
01:58drag the brain in an infinite spiral.
02:01Some Reddit users have confided that they would like to live in this surrealist village.
02:06For my part, I would follow them willingly.
02:10Now let's try a more elaborate illusion.
02:12That of the chests.
02:14What do you discern here?
02:15Let me guess.
02:1720 squares?
02:18They are also called chests.
02:21These rectangular shapes have encased panels that are often found on the ceiling.
02:25This visual illusion was discovered by a psychology professor
02:29in the context of research intended for future experiments.
02:33Are you ready for the big revelation?
02:3616 circles are hidden between the squares.
02:39This visual illusion has been a great success.
02:42You first perceive the squares, because your brain favors the corners and angles.
02:47Probably because the clear lines provide him with more crucial information than the curves.
02:52In addition, the rectangular shapes are omnipresent around us.
02:56Computer screens, panels, buildings, to name a few.
03:01The next illusion has caused a lot of online discussion
03:05and I would like to know your opinion.
03:07What do you distinguish behind this fan of colors?
03:09Is it a baboon or maybe a lion?
03:12Some see it as a bear, while another interpretation evokes a migal.
03:17For my part, I would rather opt for a human silhouette.
03:20But here, no answer is truly good or bad.
03:25Get ready for another illusion that has aroused controversy on the Internet.
03:30Some people claim that they feel the effect of 3D glasses by looking at it.
03:35The red circle seems to float in the foreground,
03:38while the blue appears as a simple background.
03:41Others, however, do not perceive anything special in this image.
03:45If you perceive this 3D effect, it is thanks to a subtle game of optics
03:49that triggers when your eyes fix adjacent colors.
03:53It then becomes difficult for them to focus on the two colors simultaneously.
03:57This phenomenon is explained by the differences in wavelength of the colors,
04:01which correspond to the dimensions of the luminous waves that each color produces.
04:05Your brain fails to integrate them harmoniously,
04:08and illusions are formed, making you see things that are not really there.
04:13Here is the impossible triangle, also called the Penrose triangle.
04:18Do you see what is wrong?
04:20In an ordinary triangle, the three sides join harmoniously,
04:24each imbuing itself in the next.
04:26At first glance, the Penrose triangle seems to respect this rule,
04:30but by looking at it more closely,
04:32we see that one of its sides seems to be simultaneously located at the front
04:36and at the back of another side, which is impossible in the real world.
04:40This is why we qualify this figure as an impossible object.
04:43If you tried to reproduce it using sticks or blocks,
04:47the assembly would inevitably fail, because it contravenes the laws of geometry.
04:52Other impossible figures exist, which have four sides or more.
04:58Ready for the next illusion?
05:00The two red lines seem to be curved inwards,
05:03although in reality they are perfectly straight.
05:06This illusion is part of these visual tricks that give linear drawings
05:10a strange or deformed appearance.
05:13Scientists believe that this phenomenon occurs
05:16because our brain tries to interpret the angles formed by the intersections of the lines.
05:21In the presence of sharp angles,
05:23our brain sometimes tends to perceive them as more pronounced than they really are.
05:28Here, the blue lines cross the red ones,
05:31misleading our brain
05:33and pushing it to perceive a curve towards the inside of the red lines.
05:39So, what do you see here?
05:42A bright white triangle placed on other figures.
05:45Congratulations, you have just been trapped by the Kanitsa pattern.
05:49There is actually no triangle in this image.
05:52What you see are actually three forms evoking Pac-Man.
05:56Our eyes and our brain are remarkably able to fill in the missing elements
06:01and perceive complete shapes,
06:03even when they are not really there.
06:06This is why we perceive a triangle that seems brighter
06:10and seems to be above Pac-Man shapes,
06:12when it is just an illusion.
06:14There is another similar phenomenon,
06:17the Kanitsa square,
06:18where your brain also perceives a square that is not really there.
06:24If you have a miniature train circuit at home,
06:27you can observe the next illusion in action.
06:30You just have to take two segments of identical size curves
06:33and place them side by side.
06:35One of them will then appear much larger than the other.
06:38But wait!
06:39You have just seen for yourself that these pieces were identical.
06:43In fact, your brain makes a comparison between the two sides of the adjacent segments.
06:49It analyzes the right side of the track on the left
06:52compared to the left side of the track on the right.
06:55Let's move on to something else before the train arrives.
06:58Here we have 12 points, all of the same color.
07:01Mauve.
07:02Now, try to fix the cross located in the center of this ring of points.
07:07When a mauve point disappears momentarily,
07:10a green point takes its place.
07:12Amazing!
07:13This green point gradually erases other mauve points
07:16as it moves around the circle.
07:18This illustrates the effect of images remaining in action.
07:21The sticks and cones of your eyes adapt to the constant disappearance of mauve points,
07:26replacing them with a color located at the opposite end of the spectrum,
07:30which gives you the impression of seeing green.
07:35How many colors can you see here?
07:37Did I hear someone say 3?
07:39Or maybe 17?
07:40There is no right or wrong answer.
07:43It was the Austrian physicist Ernst Masch
07:46who was the first to observe this paradox.
07:49You can easily distinguish similar colors
07:51or slightly contrasting shades when they are close to each other.
07:55However, as they move away,
07:57the difference becomes more and more difficult to perceive,
08:00and at some point, it becomes almost indistinguishable.
08:03If you are unable to distinguish the contrasting colors here,
08:07this can be due to the way your brain is structured,
08:10or to a slight offset of your contrast and brightness parameters.
08:15How many black dots can you identify in this image?
08:18There are 12 in total,
08:20but most people cannot see them all at the same time,
08:23even if they are perfectly visible.
08:25Your peripheral vision is not accurate enough
08:28to be able to see each dot,
08:30except when you look at them directly.
08:33Your brain must therefore fill these gaps,
08:36and the white between the gray lines
08:38leads you to think that these dots are black dots.
08:42In this way, it concludes that there is in fact only more gray,
08:45and that black dots are absent.
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