I’m assuming nothing can be definitively proven because if so Lester’s statement would be made with more certainty. And, perhaps those of us who love this possibility are desperate 21st century folk hoping to find Da Vinci where we can to anchor our vague perceptions of him on something more tangible. Still, I love the fact that there’s an idea that’s making me see this statue with new eyes (even if ones easily seduced by only a Da Vinci theory).
Here’s a web site that lets you see Donatello’s David front and back. http://employees.oneonta.edu/farberas/arth/arth213/donatello_david.html
Lester also cites Vasari’s work (which as we know might be equal parts truth and equal parts Vasari’s deification of his subjects) which notes that Da Vinci was a vegetarian “who would buy caged birds just for the joy of setting them free.”