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London artist Stuart Semple has built bought a machine that makes a lighter-than-air foam using glycerin, food dye, and helium, and extrudes cakes of it through a die to create floating foam happy faces, which he releases into the air 2,000 at a time. Check the vid below.

Sean Michael Ragan

I am descended from 5,000 generations of tool-using primates. Also, I went to college and stuff. I write for MAKE, serve as Technical Editor for MAKE magazine, and develop original DIY content for Make: Projects.

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