Mum, is this cliff safe to climb?

[By: Julia Mermier]

In 1960, Gibson and Walk came up with a brilliant idea to investigate depth perception in infants. They built this “visual cliff” apparatus, consisting in a checkerboard cloth covered by a Plexiglas board on which the infant could crawl.  On one side of the apparatus, the cloth was positioned right below the transparent board, while on the other side, the cloth was placed 1.2m deeper, giving the illusion of depth.

 

Read moreMum, is this cliff safe to climb?