In the late forties, visual researcher Adelbert Ames Jr. designed a series of visual illusions to demonstrate how the mind forms hypotheses about reality and depth. In one such illusion, Ames tested aspects of depth perception in a specially designed, distorted room.

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Remember that picture? You know, the one that you thought looked like something else and then you realised it was just a lamp? Well, maybe you were right the first time!

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This excellent 3 simulation features the popular UK childrens’ TV entertainers “The Chuckle Brothers”.

This animation from Plus magazine illustrates how you create a Klein Bottle.

This is an amazing animation by Javan Ivey created by cutting out hundreds of paper stencils and then layering them on top of each other and… well, just watch and you’ll see.

Here’s another great animation of a hypercube found at harvard.edu.

Here’s another take on the rotating snake illusion, this time as cogs.