The duck-rabbit image above is one of the most iconic in philosophy – so iconic that a former undergraduate of mine had it tattooed on his leg. So what’s philosophically significant about this dot and ...

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 ...

Is this a rabbit or a duck? The answer you give to this classic optical illusion says a lot about your brain, psychologists claim. It first appeared in a German magazine in 1892 under the title ...

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.