00:00Isn't Harry Styles looking kind of strange to you?
00:04Yeah, he's upside down and all, but that's not what I'm talking about.
00:08There is something else bizarre happening here, and I'll give you one second to figure
00:12it out.
00:13Really pay attention to every tiny detail in this photo.
00:16So, did you catch it?
00:19Look at his mouth and his eyes.
00:20Even though everything else is flipped, his mouth and his eyes look normal.
00:24I mean they're upright, but I bet you probably only noticed after I pointed it out, right?
00:29This phenomenon is known as the inverted face illusion.
00:33See, our brains are wired to recognize faces in their usual upright position, taking on
00:38the whole face at once and spotting details almost instantly.
00:42But when a face is flipped upside down, it's suddenly a lot harder to catch anything unusual.
00:47So at first glance, you might think the mouth and eyes are upside down too, just like everything
00:52else.
00:53Warning, this is not just a boring image of black and white stripes.
00:59I promise there is something, or better yet, someone, hidden behind those bars.
01:05To see it, all you have to do is shake your head quickly.
01:08If you're trying to avoid a headache or shaking your head in front of your co-workers seems,
01:13well, odd, there is another trick.
01:15If you're on a laptop, tilt the screen, step back, and look at the image from a side angle.
01:20Can you see Taylor Swift appearing on the screen?
01:23Yep, there she is!
01:27There is something about masks that just creeps me out.
01:31And things are about to get even creepier here.
01:34Right now, it's just a mask turning really slowly.
01:37Okay, keep going.
01:38Oh, wait, are we seeing the front of the mask again?
01:42Actually no, the mask is still spinning.
01:45This is called the hollow face illusion, also known as the hollow mask illusion.
01:50What happens here is that our minds are tricked into seeing the back of the mask, the concave
01:55side, as the same as the front, or convex side.
01:59In other words, instead of seeing the back of the mask as hollow, most of us see it as
02:03a regular face popping out toward us.
02:07This trick works because our brains rely more on what they expect to see, a 3D face sticking
02:12out, than what is really there.
02:15It's like our brain just says, nope, I'm sure this is a regular face.
02:20Here's another spinning illusion for you.
02:22Tell me in the comments, do you see a girl spinning to the right or to the left?
02:28This is called the spinning dancer or the silhouette illusion, and it's been puzzling
02:32minds all over the internet since 2003.
02:36The reason is that while some people see the dancer spinning clockwise, others swear she
02:40is moving counterclockwise.
02:42So who's correct?
02:44Short answer, both.
02:46Long answer, it just has an optical illusion that messes with our depth perception.
02:51At certain points in her spin, you can't really tell if her arms, for instance, are
02:55moving in front or behind her body.
02:58So your brain just guesses, creating the illusion that she could be spinning either way.
03:03What makes it more interesting is that if we add a few lines, suddenly your brain isn't
03:08confused anymore.
03:09It can now totally tell which direction the girl is spinning, even if it works both ways.
03:17Can you spot something odd with these photos?
03:19For some strange reason, you might not have noticed that the top half of both photos is
03:24the exact same picture of Ryan Gosling.
03:27But why do we think they're two different photos?
03:30This effect is called the composite face illusion.
03:33Basically, when you line up the top half of one face with the bottom half of another,
03:37our brains interpret it as a completely new face.
03:41The bottom half messes with how we see the top half, and vice versa, making it all blend
03:46together.
03:47This illusion only really works when the face is upright.
03:50Flip it upside down or misalign the halves, and suddenly our brains can separate them
03:54more easily, letting us spot the original faces faster.
03:59This way, it's much easier to see that the two top halves are exactly the same.
04:06Why is Adele's head just floating in the middle of nowhere?
04:10Let's throw in a background for some context.
04:12Whoa, ok, that wasn't exactly what I had in mind, but alright, let's go with it.
04:17Now look around Adele.
04:19Do you think that the background is moving or not?
04:22Got your answer?
04:23Well, the background seems to be moving, but it's actually totally still and flat.
04:29If you don't believe me, just pause the video and you'll see that those purple and yellow
04:33waves keep moving, like crazy!
04:36The reason is that this pattern was designed to trick your brain into seeing motion with
04:40contrasting colors, shapes, and positions.
04:43Our brain interprets change in light as movement, so the lines look like they're moving.
04:49But here's something even cooler.
04:51Focus your eyes only on Adele and try your best not to blink.
04:55Just keep staring at her.
04:57Now tell me, did you notice how the illusory motion seems to slow down?
05:01Wild, right?
05:04A lot of optical illusions we see online play with the contrast effect.
05:08This is all about how our brains perceive things based on what they're compared to,
05:13so our perceptions can be enhanced or diminished based on these comparisons.
05:18Wanna see it?
05:20Let's take a photo of Dua Lipa.
05:22Double it and make it look greyish.
05:24See, they're exactly the same color and tone.
05:28But suddenly, your perception might change.
05:31One of them will get a light grey background and the other will get a black one.
05:36Now the grey tones in Dua Lipa's photos look different from each other, right?
05:41If you can't see the effect with Dua Lipa's picture, don't worry.
05:44Here's an easier example.
05:46Trust me, the two inner grey rectangles are exactly the same color, but you're probably
05:51seeing the bottom one as darker.
05:54That's because this small rectangle is surrounded by a lighter shade compared to the top one.
05:59See?
06:00It's all about how our brains perceive things, taking the surroundings into account.
06:06Ready for a trip?
06:08Keep your eyes on this helm as we prepare to set sail.
06:12So is this ship's wheel turning right or left?
06:15Well, it depends because you can actually control it.
06:18Tilt your head slowly to the left, and you will see the ship's wheel move in one direction.
06:23Now tilt your head to the right.
06:25Slowly, don't rush.
06:28Can you see what's happening?
06:30It looks like our ship just changed direction.
06:34Something similar happens here.
06:37This time, the image of the circle is totally static.
06:40But you can make it look like it's moving.
06:42Just focus on the black dot in the center and move your head back and forth.
06:47Now you're probably seeing the circle rotate.
06:50This illusion works because our brain processes motion direction by detecting the line ends
06:55and angles, which can create conflicting signals.
06:59Tricking our brain into seeing rotation.
07:04I'm almost sure you think this image is tilted like those columns, especially the ones in
07:08the center, are somehow bending.
07:11But once again, your mind is playing tricks on you.
07:14Look, if we add white lines forming a rectangle, you will see that the vertical and horizontal
07:19lines are completely straight.
07:23Let's wrap up with some fun homework.
07:26Next time you pass an old-school barbershop, stop and take a good look at the classic spinning
07:32pole outside.
07:34Isn't it hypnotizing?
07:36The red and blue stripes seem to be endlessly going up or down.
07:39But here's the truth.
07:41The stripes aren't moving upward or downward at all.
07:44They're just rotating around the pole horizontally.
07:49What happens is that these stripes are diagonal.
07:52So when the pole spins, instead of the stripes looking like they're going in a circle, they
07:57seem to move straight up or down the pole.
08:00That's it for today!
08:03So hey, if you pacified your curiosity, then give the video a like and share it with your
08:08friends.
08:09Or if you want more, just click on these videos and stay on the Bright Side!
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