Modern DSLR cameras use the Phase Detect autofocus method to determine the correct point at which to focus the lens. This method is fast and generally accurate, and operated by light travelling through the lens. When you half-press the shutter button on your DSLR while looking through the optical viewfinder, it’s Phase Detect autofocus that’s used.
The School of Athens - Raphael
Mona Lisa - Leonardo Da Vinchi
Ghent Alterpiece - Jan Van Eyck
Birth of Venus - Botticelli
David - Michelangelo
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An audience.
This is a minimalist view, but it works as an audience can be considered to be an essential element of theatre.