evidence: Leonardo da Vinci is one of the greatest artists of all time, yet he left many works unfinished. Had he not finished those he did, we might never have known his name. [...] "Leonardo di ser Piero da Vinci; April 15, 1452 – May 2, 1519, Old Style) was an Italian Renaissance polymath: painter, sculptor, architect, musician, mathematician, engineer, inventor, anatomist, geologist, cartographer, botanist, and writer. His genius, perhaps more than that of any other figure, epitomized the Renaissance humanist ideal." [...] – Leonardo Da Vinci