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Kahn played with natural light in the Fort Worth building, suffused with skylights, reflectors and cycloid barrel vaults.

That curve, called a cycloid, is produced by a point on the circumference of a circle or wheel as it rolls along a straight line.

There are connections to be made between some of these displays — even the “Tracks of Galileo” with its allusion to “cycloids” and the rectangular-wheeled trike — that might have also been subtly explored.

This curve of quickest descent, as it is sometimes called, is, in a vacuum, the same as the cycloid.

It is impossible to mill out even a convex cycloid or epicycloid, by the means and in the manner above described.