"Space and time are like the two lenses in a pair of glasses. Without the glasses we could see nothing. The actual world, the world external to our minds, is not directly perceivable; we see only what is transmitted to us by our space-time spectacles. The real object, what Kant called the Thing-in- Itself, is transcendent, beyond our space-time, completely unknowable... Perceptions are in, in a sense, illusions. They are shaped and colored by our subjective sense of space and time."

Martin Gardner, Mathematician

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