"Man is incapable of imagining that time could ever stop. For us, even if the earth should cease turning on its axis and revolving around the sun, even if there were no longer days and nights, summers and winters, time would continue to flow on eternally.

It is no easier for us to imagine that somewhere, past the farthest stars in the nocturnal heavens, there is an end to space, a borderline beyond which "nothing" exists. The concept "empty" does have some meaning to us, because we can at least visualize a space that is empty, but "nothing," in the sense of "spaceless," is beyond our capacity to imagine. This is why, since the time when man came to lie, sit, and stand on this earth of ours, to creep and walk on it, to sail, ride, and fly over it (and now fly away from it), we have clung to illusions--to a hereafter, a purgatory, a heaven and a hell, a rebirth or a nirvana, all existing eternally in time and endlessly in space."

- M.C. Escher