Mu Qi's Six Persimmons emphasizes ____ in life

Several cultures are known collectively as the "mound builders." The most famous of the mounds still visible is:

A. Spiral Jetty. B. the Serpent Mound. C. the Crouching Dog Mound. D. the Pyramid of the Sun. E. the Mound of Venus.

n freestanding sculpture, the artist entices the viewer to move around the work by creating a series of changing ________.

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