The rotating platforms have a stationary base and a rotating top. The top part has two platforms attached that the playter can stand on and a middle part that’s ornamental only.
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Platforms that the player stand on must be round (when seen from top); not square, or else they will intersect with adjacent walls when rotating. The middle part might have a large vase, some kind of sculpture or other ornamental feature. It should reach up to around hip height so that it fills the player’s field of view significantly, but the player can still easily see over it.