This problem's question: What is the name of the surface approximated in the photograph?
There are multiple answers that describe the shape. You need to select the most specific correct answer.
This is a ruled surface . The pipes are representing the rules on that surface. A line has no breadth (See Euclid). These pipes do have breadth. It is necessary to take that fact into consideration.
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This is a photograph of Robert Wilson 's Tractricious outdoors sculpture on the grounds of Fermi National Accelerator Labortory near Batavia, Illinois, USA.
The approximated shape is that of a hyperboloid of one sheet , which is a member of the class of quadric surfaces .
Director Wilson is buried on the grounds.