All men whilst they are awake are in one common world: but each of them, when he is asleep, is in a world of his own.
Plutarch... being perpetually charmed by his familiar siren, that is, by his geometry, he neglected to eat and drink and took no care of his person; that he was often carried by force to the baths, and when there he would trace geometrical figures in the ashes of the fire, and with his finger draws lines upon his body when it was anointed with oil, being in a state of great ecstasy and divinely possessed by his science.
PlutarchThemistocles replied that a man's discourse was like to a rich Persian carpet, the beautiful figures and patterns of which can only be shown by spreading and extending it out; when it is contracted and folded up, they are obscured and lost.
Plutarch