Leonardo took great joy in all things mechanical. We used to tease him about it, about how he could stand fascinated by the works of a drover's cart, or a bricklayer's winch. I'm sure that he would appreciate the intricacies of this puzzle I have devised. After all, I created it with him in mind. Cosimo
Of course, Leonardo's genius was not confined to the mechanical and the artistic. That's what made Leo so choice a companion, that he could grasp our teachers' lessons faster than they themselves could explain them, turn around, demonstrate an opposite lesson to the poor old greybeard, and later, run about skylarking, wrestling and shouting like any common peasant boy. Leo could run quite swiftly. He might not appreciate this puzzle these days, being old and bent as I, too, have become, but I'm sure it will bring back happy memories of the days he could outrun us all. Cosimo
