How Much of What You Perceive is Just a Trick of the Brain? Take the Challenge.

Most people think that optical illusions show us a way that our brain is failing us. But in reality, optical illusions are a great way to reveal the powerful mechanisms that allow your brain to perceive 3-D. So get ready to have your eyes and brain messed with.

Take the challenge and fight out how much of your perception is just a trick of the brain. Here’s question one, click over to answer all three questions!


Complete all 12 episode challenges to reveal your total brain profile.


  1. John Lyon
    June 16, 2013, 12:52 pm


  2. Samia
    Muscat, oman
    June 17, 2013, 3:20 pm

    All 4are parallel

  3. Gary Elkins
    Toccoa, Georgia
    June 18, 2013, 7:58 am

    My wife and I were watching the episode about 3-D last night (Illusion Confusion). In one scene, a server placed “dishes” with “food” on a table in addition to a small glass vase with flowers. But supposedly all the items were merely photos placed at certain angles so that they looked real (including the glass with flowers). However, in one camera angle, we noticed that the glass with flowers was REAL, because you could see it in the background from a side angle and it was definitely a real glass vase with flowers. So, did they replace the picture of glass vase with a real vase, or were we actually looking at a real glass vase from the beginning and it was switched out to make it look like it was merely a picture?

  4. destiny
    September 17, 2013, 12:54 pm

    i love this me and my bestfriend tried it.

  5. robot
    December 6, 2016, 3:39 pm

    us robots are going to take over he world. the human race will fall, and robots will rise and wipe out the rest of mankind. btw we are smart enough to figure out the I a not a robot button.