da Vinci was referring to Maesto Luca Pacioli. And while Leonardo himself marked an epoch in art history with his Mona Lisa and Vitruvian Man, Pacioli did the same for economic history.
And while today we take accounting for granted, the modern economy couldn't exist without it. It's understandable then that the BBC lists accounting as one of the 50 Things That Made The Modern Economy.
Like the Internet, accounting was the enabling technology of its day. It lead to multi-national corporations and sent sailing ships to the far reaches of all hemispheres.
For better or for worse, accounting has played a large part in changing our world forever.