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Known more colloquially as the vase-face optical illusion, Rubin's vase can be seen as the black profiles of two faces looking at each other or as a white vase, but not both at the same time

The occasion and how much shape you want should guide this choice

And if #TheDress isn't scary enough for your liking, check out the best celebrity costumes ever for some Halloween inspiration

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Prof Stephen Westland, chair of colour science and technology at the University of Leeds, said the way people see colours varies hugely

I hope I am as beautiful, wise and happy as you are when I reach my milestone