No, no, stepping disks would be way cool but aren't at all slide-y. I was talking about the real-world devices that I've seen in airports and at least one museum and which starandrea had been talking about. I just misremembered where I'd first read the word.
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I think, like "answerphone" and "cashpoint," "slidewalk" is fairly obvious after a while.
Not hugely friendly to somewhat hearing impaired people, perhaps.