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The company uses re-purposed artificial snow machines to generate the floating ads and messages, dubbed Flogos. The machines can pop one Flogo out every 15 seconds, flooding the air with foamy peace signs or whatever shape a client desires. Renting the machine for a day starts out at a cost of about $2,500. Designers use computer software to make a stencil that when placed into the snow machine, “cuts the foam in the exact right shape,” said Flogo inventor Francisco Guerra. (via Sky-High Ads Float Like Clouds | LiveScience)