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Previously: Watch this fantastic "Circle in Circle" optical illusion machine in action The post Phew! Creepy alien on a recent flight turns out to be an optical illusion appeared first on Boing Boing.

An optical illusion which supposedly shows two dogs on a snowy walk alongside a person has stumped a host of Reddit users.

Optical illusions have been proven to be a great brain exercise as it encourages problem solving skill and creative thinking while also helping us understand the way our brains and eyes work together.

Are you ready to put on your detective hat and dive into a creepy murder scene? This brain-teasing optical illusion will test not just your eyesight but also your knowledge of classic horror movies!