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There are three. Michelangelo, Verrochio, and Donatello
Bernini's David has started to use the slingshot. Michelangelo's David is just observing the enemy.
Michelangelo
Michelangelo sculpted David in 1504.
David Gianetti has written:
'Invito al cinema di Michelangelo Antonioni' -- subject(s): Criticism and interpretation