What primary element of light helps the observer see three-dimensions

The byzantine style introduced what what into the history of art ?

Brancusi's well-known sculpture of a bird was intended to a. display the physical qualities of a bird. b. emphasize the relative size of birds to humans. c. show the calming attributes of birds. d. emphasize the graceful qualities of a bird. select the best answer from the choices provided a b c d

David is preparing a presentation on art history. complete the sentence to david describe a significant change in christian art