Some pretty talented guys had already sculpted David when this Vatican architect did his, seen here, in 1623
The blessed soul's eyes are carved with irises and pupils upturned ... by 
appealing to the five earthly senses, and so does Bernini's marble ... A large-as-
life statue of David (16231624), loading the slingshot ... and versatile: he had 
the touch no matter what he put his hand to.