When a child looks up to find drawings on the ceiling of a cave, she wonders how they were painted. Planets that spin, the birds and the beasts, woman and man--

"In 1845, Sammy, a Chinese American girl, and Annamae, an African American slave girl, disguise themselves as boys and travel on the Oregon Trail to California

'During the Tang dynasty, the Chinese artist Wu Tao-tzu was one day standing looking at a mural he had just completed. Suddenly, he clapped his hands and the te