Hopper derived his subject matter
from two primary sources: one, the common features of American life (gas
stations, motels, restaurants, theaters, railroads, and street scenes) and its
inhabitants; and two, seascapes and rural landscapes.
Regarding his style, Hopper
defined himself as "an amalgam of many races" and not a member of any
school, particularly the "Ashcan School".
Once Hopper achieved his mature style, his art
remained consistent and self-contained, in spite of the numerous art trends
that came and went during his long career.