A couple of things are at play here. First, since they’re not solid stairs, they have just a tiny bit of give to them. The whole thing moves down a bit when you put your weight on it, and bounces up when you put less pressure on it. It gives it a bit of a bouncy feeling. Perhaps more important is just the fact that you subconsciously expect it to move, and it doesn’t. We don’t do well with things not behaving as we expect.
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