Buzz·Updated on Sep 1, 2020. Posted on Jan 5, 2016Can You Pass This Simple Perception Test?Spoiler alert: Your brain is playing tricks on you.by Kelly OakesBuzzFeed Staff, UK FacebookPinterestTwitterMailLink 1. Which square is a darker shade of grey? Edward H. Adelson / Adrian Pingstone / CC / commons.wikimedia.org A Correct Incorrect A B Correct Incorrect B They're both the same shade Correct Incorrect They're both the same shade Correct! Wrong! They're the same! If you still can't see it, hold your hands over the rest of the picture so you can see just those two squares. They look different because your brain compensates for the shadow, and because square B is surrounded by darker squares. 2. Which tower is leaning more to the right? Georges Jansoone / CC / en.wikipedia.org Left hand tower Correct Incorrect Left hand tower Right hand tower Correct Incorrect Right hand tower They're leaning the same amount Correct Incorrect They're leaning the same amount Correct! Wrong! It's exactly the same picture, so they're leaning the same amount. But when you put them side by side, your visual system processes them as part of the same scene and leads to you believe the righthand picture must be leaning more. This illusion was described in 2007 by Frederick Kingdom, Ali Yoonessi, and Elena Gheorghiu at McGill University. 3. Which orange circle is larger? Left Correct Incorrect Left Right Correct Incorrect Right They're the same Correct Incorrect They're the same Correct! Wrong! They're the same. Getting the hang of it yet? The two central orange circles are exactly the same size, but the relative size (and possibly the distance) of the outer blue circles makes the orange circle on the right appear larger. 4. Which black dot is bigger? Famousdog / CC / en.wikipedia.org Left Correct Incorrect Left Right Correct Incorrect Right They're the same Correct Incorrect They're the same Correct! Wrong! They're the same. It's very similar to the effect you saw in the above illusion. 5. Which arrow line (not including the arrowheads or tails) is longest? Top Correct Incorrect Top Middle Correct Incorrect Middle Bottom Correct Incorrect Bottom They're all the same Correct Incorrect They're all the same Correct! Wrong! They're all the same. Who would have guessed it?! The arrow lines are all the same length, but the heads and tails make you see them as different lengths. You can see from the image to the left that they are in fact all the same length. 6. Which grey bar is darker? Lockal / en.wikipedia.org Left Correct Incorrect Left Right Correct Incorrect Right They're both the same shade Correct Incorrect They're both the same shade Correct! Wrong! They're the same. There's no definitive explanation for why this illusion happens, but a paper published in 2007 offers a possible solution, if you want to go in depth. Go here and use the interactive tool to try a similar illusion. 7. This one's a bit trickier. Which way are the outer dots spinning? Tap to play or pause GIF Tap to play or pause GIF moillusions.com Clockwise Correct Incorrect Clockwise Anticlockwise Correct Incorrect Anticlockwise They're spinning in different directions. Correct Incorrect They're spinning in different directions. Correct! Wrong! They're all spinning anticlockwise. But if you focus somewhere above the image, you'll perceive them as going clockwise. To see their true direction – anticlockwise – focus on either the central red or yellow dots. But be warned, the other circle will then look like it's going clockwise.