The duck-rabbit illusion, originating from a German magazine in 1892 and later referenced by Wittgenstein, demonstrates how perspective shapes perception. Seeing either animal first reveals cognitive ...

This optical illusion explains how our eyes and brain together interpret what we observe. Yet at times, they become somewhat confused, and that’s when the real trick starts. If you see the duck, you ...

Optical illusions have a playful power: they trick our eyes, tease our brains, and make us question what we think we see. But some illusions do more than confuse—they offer a small window into how you ...

14:23, Mon, Feb 15, 2016 Updated: 15:46, Mon, Feb 15, 2016 The tried and tested old teaser has been used by psychologists to understand more about the viewer - and the internet is loving it.