Guglielmo Ebreo wrote the first known treatise on which of the following disciplines?

In the Doric order, which of the following are alternating panels in the frieze, which are sometimes sculpted?

a. metopes b. triglyphs c. palmettes d. volutes

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

What will be an ideal response?