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There is a way to photograph air in a room. It makes convection, breathing and movement visible. The result looks a bit like a soap bubble.

This is some kind of optical effect. No special gases or fogs or powders are used.

What's this special form of photography called?

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You think of Schlieren method? Google for Schlieren or Schlieren-photography.

[EDIT]: Wikipedia article Schlieren photography

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Ahh, thank You for editing in that link. –  Georg Apr 19 '11 at 17:44

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