Today's optical illusion of coloured rectangles makes them appear to be turning - even when they aren't.

Although the artwork appears to be moving, it is static and a trick on our minds. 

What do you see? Look at the image for 15-20 seconds.

Often optical illusions use shapes, space, postion, colour contrasts and lines to fool our minds into thinking images are moving when they are not.

Scientists believe that it could be due to involuntary eye movements.

Others believe that changes in neurons can overpower motion detectors in the visual cortex of our eyes, and therefore movement is triggered.

Lenstore, a contact lens company, challenged viewers to look at different circles and see what happens.

Optical illusions can blow our minds all year around but how you perceive them could be influenced by what month it is, experts claim.