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However successful the theory of a four dimensional world may be,
it is difficult to ignore a voice inside us which whispers:
"At the back of your mind, you know a fourth dimension is all
nonsense". I fancy that voice must have had a busy time in the
past history of physics. What nonsense to say that this solid
table on which I am writing is a collection of electrons
moving with prodigious speed in empty spaces, which relative to
electronic dimensions are as wide as the spaces between the
planets in the solar system! What nonsense to say that the thin
air is trying to cursh my body with a load of 14 lbs. to the
square inch! What nonsense that the star cluster which I see
through the telescope, obviously there NOW, is a glimpse into a
past age 50'000 years ago! Let us not be beguiled by this voice.
It is discredited...
-- Sir Arthur Eddington
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