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Table Size Illusion
Category: Size and Distance | Added: June 4, 2009 | 15 comments
These two tables in this image by Roger Shepard appear to be different sizes, the one on the left is oriented vertically and seems to be longer and thinner. Remarkably, both tables are actually exactly the same size.

Table Size Illusion
Image Credit: Roger Shepard

Gradient Stripe Illusion
Category: Shape and Color | Added: June 4, 2009 | 14 comments
This image shows a grey stripe on a gradient background. The stripe appears to be shaded with a grey gradient also, however if you look closely you'll see that in reality the stripe is the same color all the way across.

Gradient Stripe Illusion
Image Credit: Wikipedia user Dodek

Ebbinghaus Illusion
Category: Size and Distance | Added: June 4, 2009 | 5 comments
The Ebbinghaus Illusion, also known as Titchener circles is an image of two circles with additional circles around them. In this case the orange circle on the left is surrounded by large blue circles and the orange circle on the right is surrounded by small blue circles. But which is larger, the orange circle on the left or the orange circle on the right ? The answer is of course - they are both the same size.

Ebbinghaus Illusion
Image Credit: This image is believed to be in the public domain.

Same Color Illusion
Category: Shape and Color | Added: June 4, 2009 | 13 comments
In this picture the squares marked A and B are exactly the same color, despite the fact that A looks a lot darker than B. The fact that B falls within the shadow of the green object fools the eyes in to perceiving the shades of grey differently. It is in fact very difficult to see these two squares as the same color even when you are told that they are.

Same Color Illusion
Image Credit: Adrian Pingstone

Mystery Image
Category: Shape and Color | Added: June 4, 2009 | 162 comments
The question here is straight forward enough - what is this a picture of ? The answer is simpler than you might think.

Mystery Image
Image Credit: This image is believed to be in the public domain.

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