You are butt-naked in total darkness. Sopping wet and totally alone, the space you’re in is so small that you can’t stand. The only sound is the thud of your heart. You are a mewling human baby in a mechanical womb.
Answer: When that floating island is a gigantic polyurethane balloon filled with helium. It’s an art project called Is Land and has trees and foliage decorating it to make it seem like a floating island. But it’s gone!