I have 2 videos that I took of this; one on my own in the room, and another was when an art class came in with a tour guide. I was sitting in the corner with a camera, nobody noticed me. It's fascinating seeing people react to them.
They're actually made from a government designed material that unlike balloon rubber, doesn't allow Helium to escape. There are fans situated around the room that cause them to float as they do. I believe he called this "piece" silver clouds or something similar
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