punkt widzenia

'i heard there was a thing called a sea. it is very hard to believe in a sea when you have lived only here among our dunes. we had no seas. men of Dune had never known a sea. (...) I could imagine a quanat, water flowing across the land in a canal. from this, my mind could picture a river. but a sea? (...) a sea (...) was too much for my mind to picture.'
F. Herbert, 'Dune Messiah'