I'm still thinking about the reason for the slopeing side, the ancients never did anything without a reason.
We now seem to be assuming the cutaway was to allow the bottom of the stone to clear the far edge of the hole as it rotated from a low launching tower. this could just as easily apply to a low launch from the other side if the setup was designed for the stone to begin its entry into the hole at less than vertical.
Without computors perhaps they didn't have the confidence to launch the stone towards a slopeing side but relied on the vertical side to deal with the extra momentum they had purposely built in to the system.
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