We've seen plenty of mind-blogging optical illusions over the years, and it's fair to say we'll always have room for one more. But almost every illusion we see is impressive (the human brain is quite a thing), it's not every day we see one that's also carrying an important message.
Titled They Can Disappear, this illusion by Russian artist Ilja Klemencov was created for the World Wildlife Fund for Nature (WWF), and features the organisation's iconic panda logo (arguably one of the best logos around) – you'll just have to squint to see it.
Spot the panda (Image credit: Ilja Klemencov)
Stare at those zigzag lines for long enough, and you might eventually be able to make out the shape of the Panda. Klemencov's design is an example of an illusion known as the McCollough effect. Discovered in 1965 by Celeste McCollough, the illusion is a "phenomenon of human visual perception in which colourless gratings appear colored contingent on the orientation of the gratings," (thanks, Wikipedia).
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