A commercial printing technique using small dots of color, named after 19th-century illustrator and printer Benjamin Henry Day.  Ben-Day dots were used in color comic books in the 1950s and ’60s to create effects of shading and secondary colors inexpensively. American Pop artist Roy Lichtenstein (1993-1997) used stencils to imitate the look of Ben-Day dots in his comic-inspired paintings.

Roy Lichtenstein.  In the Car (det.).  Oil and Magna on canvas. 1963.  Scottish National Gallery of Modern Art, Edinburgh.