Hadrian's most notable contribution to Roman imperial portraiture was the addition of

Masaccio's The Tribute Money, a scene of Jesus and his disciples painted in the 1420s, is notable for its pioneering use of what technique or subject?

a. atmospheric or aerial perspective b. the subtle colors of oil paint on wood c. a pagan subject drawn from an ancient Roman poem d. careful rendering of the nude human anatomy

According to the notes, _____________ can only be produced through ___________ of _____________.

Fill in the blank(s) with the appropriate word(s).