The camera obscura later became a popular tool during the Middle Ages and the Renaissance, particularly after inventors began using biconvex lenses to brighten its images. Astronomers used it to protect their eyes while observing the sun and solar eclipses, and artists employed it as an aid in portraiture and landscape painting.
Why might African American artists such as Langston Hughes reject the playing of the blues by white artists like Bob Dylan and the Rolling Stones? It disconnected the music from the social conditions in which it was grounded.
