You see?" Damien leaned over his desk and spread out half a dozen charcoal sketches. "These are only quick studies of course. But my agent in Florence tells me this artist, Leonardo, is a master and also quite an inventor of mechanical devices--which, as you know, are my passion. Leonardo just completed a portrait of Lisa de Giocondo. He calls it the Mona Lisa. I thought I might commission him to do a portrait of me, and while he's here, I can pick his mind for mechanical secrets. How does that sound?"
"Expensive," Gideon murmured.

Rick Riordan