Magic Eye: The optical illusion explained

What are Magic Eye stereograms?

• 2D pictures that create a 3D image

• Images that require cross-eyed viewing

• Pictures that cause feelings of inadequacy

• Pictures that invoke feelings of nostalgia

How are Magic Eye stereograms designed to be viewed?

• Pointed directly at the image

• Divergent viewing

• Cross-eyed

• Focused on a spot beyond the image

What is the purpose of the two dots at the top of some stereogram books?

• To create a 3D effect

• To indicate the hidden image

• To guide the viewing direction

• To help position the eyes

What is the trick to see the hidden image in a stereogram if you're having difficulty?

• Glance down and focus on the cathedral of Saint Basil in Moscow

• Use the 'difference' blending mode in Photoshop

• Duplicate the image and pull the top copy across

• Relax your eyes until you see double vision

What is stereopsis?

• The ability to view stereograms

• The perception of depth using two eyes

• The sensation of nostalgia

• The process of combining two similar pictures into one

Who first described stereopsis?

• David Brewster

• Bela Julesz

• Christopher Tyler

• Charles Wheatstone

What was the purpose of the stereoscope developed by David Brewster?

• To simulate 3D vision using flat images

• To view historical events in 3D

• To detect Nazi military assets

• To create hidden 3D images

What inspired the development of random dot stereograms?

• The need to detect depth in aerial images

• The success of the stereoscope in World War 2

• The desire to create 3D images using overlapping rectangles

• The ability to view stereograms without a special device

Who created the first computer-generated random-dot stereogram?

• Christopher Tyler

• David Brewster

• Bela Julesz

• Charles Wheatstone

What is the difference between autostereograms and other stereograms?

• Autostereograms use repeating patterns to create depth

• Autostereograms have hidden images within one picture

• Autostereograms require two images to create a 3D effect

• Autostereograms can only be viewed with a special device