THE TIME MACHINE

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'Nor, having only length, breadth, and thickness, can a cube have a
real existence.'

'There I object,' said Filby. 'Of course a solid body may exist. All
real things--'

'So most people think. But wait a moment. Can an _instantaneous_
cube exist?'

'Don't follow you,' said Filby.

'Can a cube that does not last for any time at all, have a real
existence?'

Filby became pensive. 'Clearly,' the Time Traveller proceeded, 'any
real body must have extension in _four_ directions: it must have
Length, Breadth, Thickness, and--Duration. But through a natural