----------------------------Original message---------------------------- ummm, from one who does it to who who wants to learn about it..... What do you mean "light as a symbol"? Light is used by DP's like paint is used by a painter, or pencils by a cartoonist, or clay to a sculptor. Light is a medium that we use to get our message across, not THE message itself like your title implys. Light is used to create mood, time of day, etc. It's EFFECTIVE use is the goal of every DP and Gaffer/LD. As far as books go, check out the film section in your library or local bookstore. Look at anything about cinematography, NOT about directing or writing etc... Good luck...if you have access to AOL, look at the Cinematography & Gaffers forums in Hollywood online, Below the line talk....