For example, the tabletop, although it appears to be perfectly square and flat to the naked eye, might on closer examination prove not to be so: the corners might not be at exact right angles, and it might be discovered that, when viewed through a microscope, the table surface is in fact quite bumpy and not exactly flat. ... This is similar to the fact that we cannot imagine any colour outside of the colour spectrum; although we can mix up colours to make a colour that we have never seen before, it would still be a colour essentially composed of a mixture of red, blue or yellow. ...

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• Grade Level: Undergraduate