Shutter: This allows light to pass through for a determined period of time.
ISO: This measures the sensitivity of your sensor.
Aperture: Controls the amount of light reaching your camera's sensor.
Pop Art uses iconic people or cultural symbols which can be identified as exactly what they are. Abstract Expressionism is not identifiable as a specific things or object, because it is supposed to communicate feelings. Pop Art usually sends a specific message, whereas Abstract Expressionism is art that is up to interpretation.
