Can You Find The Snake Among The Tortoises In 11 Seconds?

Optical illusions date back to ancient Greece where they were used on temple rooftops to create the illusion of curved surfaces.    

Aristotle postulated that if you cross the index and middle fingers while touching an object such as a pen, it feels like you're holding two pens instead of one.

The brain constructs images different from reality by using colour, patterns, and the interplay of light and shadow. Can you spot the snake in the next slide?

Set the timer to 11 seconds and get cracking. Remember, to pay attention to every corner of the image.    

Check out the bottom left corner of the optical illusion.