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Full Idea
Motion is nothing but change of distance between two things.
Gist of Idea
Motion is just change of distance between two things
Source
John Locke (Essay Conc Human Understanding (2nd Ed) [1694], 2.13.14)
Book Ref
Locke,John: 'Essay Concerning Human Understanding', ed/tr. Nidditch,P.H. [OUP 1979], p.173
A Reaction
If a thing moved steadily relative to other objects, and we then removed all other objects in the universe, would it still be moving?