"One can be tired of Rome after three weeks and feel one has exhausted it; after three months one feels that one has not even scratched the surface of Rome; and after six months one wishes never to leave it."

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The phenomena in these exhausted tubes reveal to physical science a new world-a world where matter may exist in a fourth state, where the corpuscular theory of light may be true, and where light does not always move in straight lines, but where we can never enter, and with which we must be content to observe and experiment from the outside.

— William Crookes