this post was submitted on 11 Jun 2025
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I fear that the spiral has a consistent radius, and is therefore a "helical staircase".
I guess that's why we call helicopters helicopters and not spiracopters. But in many medieval buildings, whose stone walls are normally thicker at the base and get thinner toward the top, the stairwell cavity would get wider as it went up, making the stairs a spiral.
That sounds pretty convincing to me. I vote spiral.