00:00Now, have you ever looked at something and thought, what am I even seeing?
00:04Well, you're not alone.
00:06Optical illusions are those sneaky little tricks that mess with our brains and make
00:10us see things that aren't really there.
00:12Today, we're diving into some of those.
00:15So here's the deal.
00:17All of these plates are turned upside down.
00:19Or are they?
00:21Find the one that's turned the right way.
00:24Aha!
00:25Let me guess.
00:26Once you've found it, all the other plates turned the right way up, didn't they?
00:30Nope, this isn't magic.
00:32Just your eyes fooling you.
00:36Moving on.
00:37Take your attention and place it on this thing right here.
00:40Is your mind already confused?
00:44So what exactly is the illusion that's happening here?
00:47This is called the aperture problem.
00:50Your eyes might've thought that the lines are moving horizontally and vertically near
00:53the squares, almost like they're blinking.
00:56But if you keep your focus on the gray squares, you'll notice that the background is uniformly
01:01sliding down the scene.
01:04Hmm, chess.
01:06Is your team black, team white, or team these pieces are the same color?
01:13I know this will sound confusing, but all the pieces are the exact same color.
01:18Don't believe me?
01:19Let's take off the background.
01:20Better now?
01:22The pieces on the top row are the same as the bottom row.
01:25Your mind is one beautiful piece of machinery, but such a noob when it comes to expectations.
01:32Now believe it or not, this optical illusion can tell you if it's safe for you to drive
01:37in the rain.
01:38Check out this image and see if you can spot the hidden sequence of numbers.
01:42Ready?
01:43Go!
01:44Did you come up with 3452839?
01:50If you did, your contrast sensitivity is top-notch.
01:54Contrast sensitivity is what allows you to see the outlines of small objects clearly.
01:59If this ability isn't well-tuned in your system, it's best to avoid driving in the
02:03rain or fog.
02:06This illusion is making people go crazy.
02:09Take a look at the image.
02:10Do you see squares?
02:12Keep staring, and we'll come back in a jiffy.
02:17If you saw something other than squares, congrats, you're part of the lucky few!
02:22This illusion is breaking the Internet because some people can spot 16 hidden circles instead
02:27of those sunken squares, also known as coffers.
02:31Meet the coffer illusion, a finalist in the 2006 Best Illusion of the Year contest.
02:37It's a classic example of ambiguous stimuli, giving our brains visual info that can be
02:42interpreted in multiple ways.
02:44The coffer illusion makes us pick between competing interpretations, and it's totally
02:49mind-bending.
02:50There's an extra catch – the way your brain will interpret the stimulus depends
02:54on your personal past experiences.
02:57At first, we'll see rectangles because it's part of our daily life.
03:01But depending on your point of view, you'll quickly switch to seeing circles.
03:07Look at this image for a moment and tell us how many bars you can count.
03:14This illusion has left the Internet scratching their heads.
03:17Some people have counted up to 11 bars, but most land on 8 or 7.
03:22The creator of this tricky image says there are actually only 6 complete bars.
03:27Try counting from the top down, and you'll see the upper bars are legit.
03:31But when you hit the 6th bar, things start getting fuzzy.
03:34That's because the last two bars are incomplete.
03:38When you try to count them, they seem to multiply, leaving you totally confused.
03:43If you trace your pointer down to the 7th and 8th bars, you'll see they're incomplete.
03:48They were just put there to mess with you.
03:52For this next experiment, you have to stare at this red dot for about 10 seconds.
03:57I'll tell you when it's over, don't worry.
03:59At first, your eyes will see a grey graphic city around the dot.
04:07Wow, what just happened?
04:17Even after the picture turns black and white, our brain is still able to perceive the original
04:22colors.
04:23This is an example of what's called an afterimage.
04:26After we fed our brain with a fixed image of something, when we turn it black and white,
04:31our brain is still trying to guess the colors of it.
04:35Now how many different scenes can you spot in this image?
04:383?
04:394?
04:40Take your best guess.
04:41I trust you.
04:42Well, it's only 2.
04:44You should be able to see the chalice in the first scene.
04:47And then, when you change your focus, you should be able to spot the profile of two
04:51faces with a white background.
04:56Moving on to the next one, I'm going to ask you to stare at this parrot's eye for 15
05:00seconds.
05:01Just keep staring at it, like we did with the last image.
05:04You're about to witness another great example of an afterimage.
05:083, 2, 1 … and close your eyes.
05:25Can you still see a red parrot?
05:28Isn't it amazing that, even though this parrot is black and white, you have the illusion
05:32of seeing the color red?
05:34Again, this is just your brain trying to guess the color of something.
05:40Let's try another one.
05:41Stare at the cross in the middle of this image for 10 seconds, starting now.
05:58Did all of the colors from the image fade away, and all you could see was a white page?
06:02Bizarrely, our brain just erases all the nuanced colors and leaves you with a white screen.
06:10This next one is pretty bizarre.
06:12Keep staring at this bunch of tiny dudes trying to escape some imaginary threat.
06:17Can you see what's the illusion here?
06:20Yeah, took me a while to figure it out too.
06:24The illusion is that it looks like these little dudes are moving forward.
06:28It looks like they're leaving the scene one by one.
06:31But in reality, they are stationary.
06:34This illusion is created by the shifting colors on the foreground.
06:37Our brains are so easily tricked, my, my, my.
06:43Now ready for another one that will ruin your brain for good?
06:46Take a look at this baby right here.
06:50It looks like a Mobius strip.
06:52Some kind of eternal loop, right?
06:54But if you stare at it long enough, you'll see that it's a wholesome image.
06:59The 3-dimensional view makes it look like the infinity symbol looping around.
07:03I swear, my brain will need to take some time alone after this video.
07:09Okay, have a look at both images.
07:11Can you tell if the circle on the right is larger than the circle on the left?
07:18Believe it or not, these two circles are the exact same size.
07:22This illusion is known as the Ebbinghaus illusion, and it was discovered by a German
07:27physiologist in the early 1900s.
07:29We can assume that his name was Ebbinghaus.
07:32One of the possible explanations for why our brain glitches when looking at this image
07:37is due to the size of the external circles.
07:40Since the circles on the right are much bigger,
07:42they make the one on the right look smaller than the one on the left.
07:48Let's move on to the next illusion.
07:50Take a look at this image carefully.
07:52Don't worry if little black dots start appearing out of nowhere.
07:55That's part of the game.
07:56And are they disappearing too?
07:58Yep, that's totally normal.
08:00This illusion is part of something called the scintillating grid illusion,
08:04or the Hermann grid illusion.
08:06There are several examples of this one on the internet.
08:09This illusion shows us one of the most important principles of human perception.
08:13You don't always see things for what they really are.
08:16The retinal cells in our eyes act as light receptors.
08:20When only one receptor gets illuminated,
08:22it perceives more light than when its colleagues are also illuminated.
08:27This prevents the firing of nearby receptors.
08:30With the Hermann grid illusion, the white lines are arranged in such a way
08:34that there's more light around the intersections than along the lines themselves.
08:40Okay, let's wrap this up with one final illusion.
08:43We have what looks like a gray bar moving up and down on an orange background.
08:48But if you stare at this little black dot,
08:51you may see the gray bar turn into a different color.
08:54What color do you see?
08:56Blue.
08:58Did you say blue?
09:00Yep, that was it.
09:01Good for you.
09:04That's it for today.
09:05So hey, if you pacified your curiosity,
09:07then give the video a like and share it with your friends.
09:10Or if you want more, just click on these videos and stay on the Bright Side.
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