" I never thought before,” said Tirin unruffled, “of the fact that there are people sitting on a hill, up there, on Urras, looking at Anarres, at us, and saying, ‘Look, there’s the Moon.’ Our earth is their Moon; our Moon is their earth.”

“Where, then, is Truth?” declaimed Bedap, and yawned.

“In the hill one happens to be sitting on,” said Tirin. "

― Ursula K. Le Guin , The Dispossessed (Hainish Cycle, #6)