In this apse mosaic from Santa Prassede, Pope Paschal holds a small model of a church. This was a medieval way of showing . . .

When and under what lighting conditions should you white-balance?

A) every time you shoot outside B) every time you begin production C) every time you shoot under a new lighting condition D) every time you shoot under artificial illumination E) every time you shoot under fluorescent lights

An altarpiece is ______ .