The Ebbinghaus illusion: Small, or very far away?

Mind gamers, which of the two centre circles below is bigger? And what does this tell us about how the visual system works?How do you tell if something looks small because it is small, or because it is very far away? It seems a ridiculous question because we make such calculations with apparent ease. As Father Ted demonstrates in the video below:Related: Is your memory as accurate as you think it is?Continue reading...