"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 Philosophical Inventor proceeded, "any real body must have extension in four directions: it must have Length, Breadth, Thickness, and—Duration. But through a natural infirmity of the flesh, which I will explain to you in a moment, we incline to overlook the fact. There are really four dimensions, three which we call the three planes of Space, and a fourth, Time. There is, however, a tendency to draw an unreal distinction between the former three dimensions and the latter, because it happens that our consciousness moves