This Math Professor Creates Perplexing Optical Illusion Objects

Impossible Rooftop illusion seems to defy gravity

It is from this type of thinking that has allowed Sugihara to become a master of the optical illusion. One of his most famous illusions is the 'Impossible Rooftop' illusion. The object, when viewed at one angle, looks entirely different from another. 

In a video demonstrating the illusion, you see a hand placing small round balls onto a what appears to a sloping roof, but the balls simply roll around and seem to settle on the slope, defying gravity. Another example is the 'Nautilus folding ladder.'

In this video, what appears to be a folded paper structure is punctured by a red rod, though each time the rod moves your understanding of the shape changes. It’s at once incredibly frustrating and amazing. 

The brain makes assumptions that help us navigate space

These tricks work because our brain makes assumptions about perception and depth, the same skills that allow us to move around the world without bumping into things also makes us susceptible to these kinds of clever illusions. 

Impossible Motion illusion will frustrate and delight

In 2010 Sugihara won the Illusion of the Year contest with his ‘Impossible Motion’ illusion. The video shows a 3D model that appears to have four slopes facing downwards from a common top point. 

When wooden points are places on these slopes, they surprise the viewer by rolling up, as if drawn by magnets, rather than down. The trick is revealed when the 3D Form is viewed from another angle, and it can be seen that the slopes actually slope downwards. 

The illusion works because our brain thinks that each supporting column of the object is vertical. and that the longest column in the center is the highest. But actually, the columns are cleverly angled to create the illusion.