In the early 16th century maps were rare and often inaccurate. Leonardo produced several accurate maps such as the town plan of Imola.
As Leonardo became successful as an artist, he was given permission to dissect human corpses at the hospital Santa Maria Nuova in Florence.
Leonardo illustrated a book on mathematical proportion in art written by his close friend Luca Pacioli and called De divina proportione.
Leonardo kept a series of journals in which he wrote almost daily, as well as separate notes and sheets of observations, comments and plans.