These stunning photos of indoor clouds might look like digital creations, but they're actually of real scenes created by Dutch artist Berndnaut Smilde.
The clouds are generated using a smoke machine, but Smilde must carefully monitor a room's humidity and atmosphere in order to get the smoke to hang so elegantly, and with such life-like form. Backlighting is used to bring out shadows from within the cloud, to give it that look of a looming and ominous rain cloud.
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