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Boy butts #3.
Before he was a Teenage Mutant Ninja Turtle, Donato di Niccolò di Betto Bardi (you see why his mother used the nickname Donatello, except when she was really angry) was a fifteenth-century Florentine sculptor.
This David, commissioned by a Medici, is his best-known work.
Like Michaelangelo's David, it also was an earliest large Western work unconnected with architecture, created to be a free-standing piece.
It's one of the first big bronze sculptures of the Renaissance. I've no idea of all the technology involved in its creation. A quick search around came up complicated and confusing. There's wax and clay and cloth and armatures that eventually lead to a mold. In goes molten copper and tin. Any moisture and the whole shebang would explode, possibly killing someone.
As a kid in the 1950's I cast toy soldiers out of molten lead. Yeah, lead. It was a toy, with a little electric furnace and a ladle and molds. Never mind the poison fumes, we didn't know about that stuff then.
My favorite soldier was the one without a gun. He had a nice butt, too.
And, wow, what a hat!
Related: Butts #1, #2.