This optical illusion is doubly confusing

Optical illusions come in many forms, and just when we think we've seen all of the best ones and become immune to their effects, along comes another mind bender to confound us even more. The optical illusion below shows two rectangles, one blue and one yellow, moving across a black and white striped background. 

The two rectangles appear to be in a race with each other, but it's neck and neck: no sooner does one pull ahead, then the other catches up. But actually it turns out that the two rectangles are moving together at exactly the same pace. And there's another level to the confusion when the background changes (for more, see our pick of the best must-see optical illusions).

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Joe Foley

Joe is a regular freelance journalist and editor at Creative Bloq. He writes news, features and buying guides and keeps track of the best equipment and software for creatives, from video editing programs to monitors and accessories. A veteran news writer and photographer, he now works as a project manager at the London and Buenos Aires-based design, production and branding agency Hermana Creatives. There he manages a team of designers, photographers and video editors who specialise in producing visual content and design assets for the hospitality sector. He also dances Argentine tango.