This was taken around 11:30am PST inside the Cathedral of Our Lady of the Angels in Los Angeles, CA. It was designed by Raphael Moneo, a famous contemporary architect. The "windows" are actually composed of very thin sheets of marble; so thin that light can pass through. The entire main body of the church is surrounded by this glazing, thus lighting the interior space and making artificial light unnecessary no matter what kind of weather, nor time of day. (Artificial lighting is used at night, in case anyone is curious.)
The time of day makes all the difference in a color photograph, morning light, the position of the sun at high noon, later in the afternoon, what some photographers refer to as "magic light". In this assignment you will examine the very nature of light and how it effects the world around them. The subject of your photograph will be the light and how it changes the environment.
The world is a different place at night, the light which normally comes from the sky and falls to the earth now radiates from the ground up, creating a world of light and shadows that most do not see. In this assignment you will photograph this world and it's inhabitants.
Use a camera support or tripod where possible, increase your ISO to the maximum usable setting and if you have one, use a cable release for longer exposures.