The optical illusion going viral on Reddit challenges people to find 16 circles in a photo filled with rectangular panels.

There are actually 16 circles in this image ... within straight lines between the rectangles — is known as a Coffer Illusion, and it was created by San Francisco-based vision scientist Anthony ...

the 'Coffer Illusion' appears to show coffers, the sunken panels that often decorate ceilings, especially in churches and temples. On closer inspection the image has 16 circles hidden in plain ...

or perhaps a series of sunken door panels - but there are actually 16 circles hiding in plain sight. "Sometimes, as in the Coffer Illusion, there is no right' grouping because the image is ...

Apparently there are 16 circles hidden within the illusion. Do you see them? Meet the Coffer Illusion, a finalist in the 2006 Best Illusion of the Year Contest created by Anthony Norcia ...

In total you should be able to spot 16 circles in the tricky Coffer Illusion. And if this brain-teaser was too easy - or too hard - for you, then why not give these a go. You could have 20/20 ...

Nothing tests your mind quite like an optical illusion. The puzzles are difficult ... of the image "flips" to enable you to see 16 circles. People have been intrigued by ambiguous shapes like ...

There are 4 such rows, and therefore adding them all together gives 16 circles. If you loved this optical illusion challenge, do not forget to try out some more challenges from our recommended ...