thumb|upright=1.75|center|The sight of stars circling the Pole star and vanishing and reappearing at the horizon could have suggested to Anaximander that the Earth was surrounded above and below by a void.
thumb|upright=175|center|The sight of stars circl.ing the Pole star and vanishing and reappearing at the horizon could have suggested to Anaximander that the Earth was surrounded above and below by a void.