At Pixar the virtual cameras can see an infinitude of light and color. The only real limit is the screen that will display the final product. And it probably won't surprise you to hear that the Pixarians are pushing those limits too.
If talking about music is, as someone once said, like dancing about architecture, then talking about color is like doing a trapeze act in zero-g on a space station.
Control the lighting, control the colors, control the feelings. That's filmmaking.