The philosopher from Samos is traditionally attributed with having conjectured that the universe, planets and Earth were round and Pythagoras' vision exercised huge influence on astronomers of subsequent eras. The Pythagorean cosmos is governed by precise numerical ratios underpinning the universal order. Traces of Pythagoreanism are found in The Psammites, the work by Archimedes that contains a revolutionary approach to large numbers and strives to calculate the number of grains of sand held in the sphere of the universe.