Forget The Dress — these optical illusions will have you questioning everything you thought you knew about life.

This dress (pictured above) caused uproar across the world wide web of social media on Friday when a heated debate sprang up over whether it was white and gold or black and blue.

One possible explanation as to why people are seeing different colours is that the image creates an optical illusion; a consequence of the way the human brain processes colours. The brain’s perception can be thrown by the colours of nearby objects, and their reflected light falling on the object in focus — in this case, the dress.

With that in mind, we’ve rounded up some some optical illusions you won’t believe. Click through the gallery, use them to trick your friends, and remember — don’t believe your eyes…