3 dimensional vision

Butterfly on a field highlighting the contrast between the background and the foreground.

The fact that we see the world in 3D is nothing but an illusion created by the brain. The claim might seem provocative, but it’s true. Our eyes have 2-dimensional retinas. So how can you get three dimensions out of two? Well, you can’t. You might argue that the two images can be merged together to form a 3D image, I mean we have all seen that in with the wave of VR glasses coming to the market. Two small displays indeed create a 3D image. But what happens if you close one of your eyes? Will you suddenly stop seeing in 3D and revert to 2D? Not really, so the two eyes aren’t the only reason why we have a 3D vision. (more…)