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This "quick tutorial" introduces the general idea of a call and explains the most common cases. It does not explain or illustrate all cases. For additional details and/or examples, refer to the links in the "MORE INFO" box.
Cut the Hourglass turns an hourglass into parallel lines. The centers of the hourglass (the dancers in the diamond) do an Hourglass Circulate to become the ends of the new lines. Meanwhile the point (outside) dancers slide together and trade to become the centers of the new lines, in the same way as for Cut the Diamond.
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