The hand-painted Ben-Day dots
Anywhere across the flat color areas, especially the lighter passages of sky
Look at the even areas of color and you will see a regular grid of dots. These are Ben-Day dots, the cheap printer’s dot-screen used to shade newsprint, named for the printer Benjamin Day. The crucial thing: here they are not printed. Lichtenstein laid every one down by hand, dabbing paint through a perforated metal screen, to imitate the look of mass reproduction. The most mechanical-looking surface in the painting is the most hand-made part of it.