Internet baffled by chessboard optical illusion

An optical illusion shows two sets of apparently distinct chess pieces.

The photograph has gone viral after being uploaded on Twitter by scientific writer Tom Chivers.

Despite current interest in the illusion, Barton Anderson and Jonathan Winawer devised it for a 2005 Nature paper.

In a foggy setting, the illusion reveals white and black chess pieces.

The supposedly white set is in a predominantly black smoke atmosphere, while the seemingly black is in a generally lighter smoke setting.

While the two sets of chess pieces seem different, they're really identical—each piece is the same as the one below it. Their appearance is deceptive.

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