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Paper sphere eversion and Morin surface
Paper sphere eversion and Morin surface
Paper Morin surface (sphere eversion halfway) with hexagonal symmetry
Paper Morin surface (sphere eversion halfway) with hexagonal symmetry
halfway top
halfway top
halfway side
halfway side
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An image of one of the most accurate human-made spheres, as it refracts the image of Einstein in the background. This sphere was a fused quartz gyrosc
An image of one of the most accurate human-made spheres, as it refracts the image of Einstein in the background. This sphere was a fused quartz gyroscope for the Gravity Probe B experiment, and differs in shape from a perfect sphere by no more than 40 atoms (less than 10 nm) of thickness. It was announced on 1 July 2008 that Australian scientists had created even more nearly perfect spheres, accurate to 0.3 nm, as part of an international hunt to find a new global standard kilogram.
Deck of playing cards illustrating engineering instruments, England, 1702. King of spades: Spheres
Deck of playing cards illustrating engineering instruments, England, 1702. King of spades: Spheres