How are there 16 circles in this optical illusion?

From rotating horses to levitiating boats, we have seen so many weird, wonderful and wacky optical illusions, here at Creative Bloq. Today's find has left me feeling utterly perplexed, and has left the internet asking – are those squares or circles?

The baffling image was shared by Dr Gavin Buckingham over on Twitter and challenged users to spot the 16 circles in the image of rectangles. This illusion is so good that back in 2006, it was placed top ten in the Illusion of the Year contest (most recently won by the Phantom Queen illusion). And seeing as it ranked so highly back then, maybe we should add this brain-frazzler to the roundup of our favourite optical illusions.

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Amelia Bamsey
Staff Writer

Amelia is Creative Bloq’s Staff Writer. After completing a degree in Popular Music and a Master’s in Song Writing, Amelia began designing posters, logos, album covers and websites for musicians. She now enjoys covering a range of topics on Creative Bloq, including posters, optical illusions, logos (she's a particular fan of logo Easter eggs), gaming and illustration. In her free time, she relishes in the likes of art (especially the Pre-Raphaelites), photography and literature. Amelia prides herself on her unorthodox creative methods, her Animal Crossing island and her extensive music library.