Don’t Believe Your Eyes: Three Illusions That Will Melt Your Brain

Bad Astronomy
The entire universe in blog form
Oct. 21 2013 8:00 AM

Three Illusions That Will Destroy Your Brain

Thanks to my evil twin Richard Wiseman (a UK psychologist who specializes in studying the ways we perceive things around us, and how easily we can be fooled), I saw this masterful illusion video that will keep you guessing on what’s real and what isn’t. It’s only two minutes long, so give it a gander:

Cool, eh? The reason you got fooled, at least twice, is that we get confused when our three-dimensional world is translated into two dimensions. We perceive distance for nearby objects using binocular vision, which depends on the angles between our eyes and the objects. If you create a picture of an object that is carefully distorted to match those changing angles, you can fool the brain into thinking it’s seeing a real object when in fact it’s a flat representation.

Advertisement

We’re actually very good at taking subtle cues and turning them into three-dimensional interpretations. However, because of that very sensitivity, it’s easy to throw a monkey in the wrench, messing up our perception.

Still don’t believe me? Then watch this, and if it doesn’t melt your brain, I can no longer help you.

Our brains are very, very easy to fool. I’ll note that the way we see color is very easy to trick, too. I wrote an article about a fantastic, astonishing color illusion back in 2009, and it spurred a lot of arguments in the comments, even when I showed clearly how it works. Amazing.

And because why not, here’s the picture (the colors get a bit squished in the middle, so you can see the original here at the bottom of the page if you'd like). Tell me, do you see a blue-armed spiral, and a green one?

blue green spiral illusion
Everything is not as it seems.

Drawing by Akiyoshi Kitaoka, used by permission

<evil chuckle>

Phil Plait writes Slate’s Bad Astronomy blog and is an astronomer, public speaker, science evangelizer, and author of Death From the Skies!  

TODAY IN SLATE

The World

The Budget Disaster that Sabotaged the WHO’s Response to Ebola

Are the Attacks in Canada a Sign of ISIS on the Rise in the West?

PowerPoint Is the Worst, and Now It’s the Latest Way to Hack Into Your Computer

Is It Offensive When Kids Use Bad Words for Good Causes?

Fascinating Maps Based on Reddit, Craigslist, and OkCupid Data

Culturebox

The Real Secret of Serial

What reporter Sarah Koenig actually believes.

Culturebox

The Actual World

“Mount Thoreau” and the naming of things in the wilderness.

In Praise of 13th Grade: Why a Fifth Year of High School Is a Great Idea

Can Democratic Sen. Mary Landrieu Pull Off One More Louisiana Miracle?

  News & Politics
Foreigners
Oct. 23 2014 3:47 PM Ukraine’s Slow Descent Into Madness While it fights rebels in the east, Kiev is beginning to crumble from the inside.
  Business
Business Insider
Oct. 23 2014 2:36 PM Take a Rare Peek Inside the Massive Data Centers That Power Google
  Life
Atlas Obscura
Oct. 23 2014 1:34 PM Leave Me Be Beneath a Tree: Trunyan Cemetery in Bali
  Double X
The XX Factor
Oct. 23 2014 11:33 AM Watch Little Princesses Curse for the Feminist Cause
  Slate Plus
Working
Oct. 23 2014 11:28 AM Slate’s Working Podcast: Episode 2 Transcript Read what David Plotz asked Dr. Meri Kolbrener about her workday.
  Arts
Brow Beat
Oct. 23 2014 3:23 PM This Is What Bette Midler Covering TLC’s “Waterfalls” Sounds Like
  Technology
Technology
Oct. 23 2014 11:45 AM The United States of Reddit  How social media is redrawing our borders. 
  Health & Science
Bad Astronomy
Oct. 23 2014 7:30 AM Our Solar System and Galaxy … Seen by an Astronaut
  Sports
Sports Nut
Oct. 20 2014 5:09 PM Keepaway, on Three. Ready—Break! On his record-breaking touchdown pass, Peyton Manning couldn’t even leave the celebration to chance.