For Dutch artist Berndnaut Smilde, the expression has an entirely different meaning.
Mainly a sculptor, Smilde creates clouds in indoor spaces and then uses photography as a means to capture their transient lives.
Using a combination of “frozen smoke” and moisture, the Dutch artist is able to create the clouds indoors that last just long enough to be photographed. The process leading up to the creation, however, can be
labor intensive with shoot preparations lasting a few days.
-Slate