An optical illusion occurs when our misinterpretation of the physical reality causes us to see things differently. While some artworks involving deceptive imagery are intended to confuse, the ambiguity can also arise from natural phenomena like light.

Here, the drone footage shows apparent silhouettes of a group of joggers in Kenya — but a closer look reveals they are just shadows.

This mind-bending optical illusion was captured in a part of Africa of a group of joggers. The drone footage shows what appears to be the silhouettes of a group of runners jogging on the Tambach track in Kenya. More layers of the video unravel the longer you look at it, ltimately revealing that the black figures are but life-sized shadows cast by the people involved.

While the concept is relatively well-known, it still stumps most viewers at first sight. When the sun is low on the horizon, the shadows created on a surface are longer. In other words, a shadow’s length depends on the angle at which sunlight is falling on Earth.

With the sun directly overhead, there’d be no shadows. This is because our local star’s rays are perpendicular to our home planet’s surface at that point. But as optical illusions go, even the veterans in the field are not infallible when looking at one. They are characterised by the misinterpretation of physical reality. Put simply, an optical illusion occurs when our eyes and brain fail to perceive the actual shape or nature of something.

While it can occur naturally, or even have evolutionary properties — like camouflage— some artworks are also intended to deceive.

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