Making something truly round is not as easy as it sounds, and it is important for many parts of sicence and engineering. For example, ball bearings need to be very round. But things can get far rounder than that. See also Flatness.

World’s Roundest Object!
The Science Of Roundness
What is the Roundest Thing?
Roundest objects in the world created
Pure Silicon Sphere. World’s Roundest Object!
Gravity Probe B
(This satellite contains extremely round quartz spheres)

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