What distinguishes 'high relief' (alto-rilievo) from 'bas-relief' (low relief) in sculpture?
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A
High relief uses marble; bas-relief uses bronze
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B
In high relief, figures project strongly from the background, often more than half their depth; in bas-relief, figures barely project from the surface
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C
High relief is attached to architecture; bas-relief is freestanding
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D
Bas-relief depicts natural scenes; high relief depicts human figures