In the last exercise, you we're asked to use daylight.
In this exercise, you'll use artificial light.
Simply walk around photographing a newspaper with different types of artificial lights—incandescent, florescent, and so forth.
The newspaper will look the same to you—white.
In the photographs, the newspaper will have different colors.
This also occurs outdoors.
The light on an overcast day is blue.
On a sunny day, shade is cyan (blue/green).
For the best color, set the white balance on your camera to match the color of the light in the scene.