The Broken Chair

With the blankest of blank expressions on their faces, these mysterious figures have been popping up in the most unlikely of places.

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Close inspection of the pictures rules out an alien invasion - small perforations around the eye areas of the masks allow the people beneath to see the world outside.

But nobody knows who the faceless figures, who often appear as motionless couples are, or why they are turning up at high profile events.

Theories include the possibilities that they are limelight-seeking pranksters, performance artists or that they are at the centre of a viral marketing campaign for an as-yet unknown product of forthcoming horror film.