Leonardo was educated at Bugia, and afterwards toured the Mediterranean.
He received the first elements of his artistic education from Cosimo Roselli; and after leaving him, devoted himself to the study of the great works of Leonardo da Vinci.
Leonardo da Vinci's rough map of the world in 8 segments (c. 1513) seems likewise to have been intended for a globe.
Leonardo cannot be regarded as the inventor of that very great variety of truths for which he mentions no earlier source.
The map or diagram of which Leonardo Dati in his poem on the Sphere (Della Spera) wrote in 1422 " un T dentre a uno 0 mostra it disegno " (a T within an 0 shows the design) is one of the most persistent types among the circular or wheel maps of the world.