Illusion games: How many circles are in this picture?

A picture has recently gone viral online leaving some viewers puzzled. The illusion called the 'Coffer Illusion' shows a pattern of rectangles, but something is hidden is plain sight.

A picture has recently gone viral online leaving some viewers puzzled.

The image called the 'Coffer Illusion' shows a pattern of rectangles, but something is hidden is plain sight.

Some people are unable to see the special secret, but others are. 

The Coffer Illusion may initially appear as a series of sunken rectangular pattern, but after a few seconds, your brain's representation of the image may 'flip' to give you the experience of 16 circles.

Relaxing you eyes will allow you to see the hidden circle pattern 

Relaxing you eyes will allow you to see the hidden circle pattern 

If you relax your eyes, you should be able to make out a pattern of circles in this illusion created by Anthony Norcia, formerly of the Smith-Kettlewell Eye Research Institute. 

The 'Coffer Illusion' derives its name from the word coffer which means a decorative sunken panel. 

Some people see some circles but not all of them. In total there should be 16 circles that appear before your eyes emerging from the rectangle pattern.