"You can really see Leonardo thinking on the paper. You can see how he first uses black chalk, and then how he changes his ideas about a particular solution, and then he will go onto another thought always on the same page." – Carmen Bambach

“You can really see Leonardo thinking on the paper. You can see how he first uses black chalk, and then how he changes his ideas about a particular solution, and then he will go onto another thought always on the same page.” – Carmen Bambach