A sculpture in red, yellow, and blue fluorescent light by Dan Flavin, titled a primary picture, dated 1964.

Dan Flavin 

a primary picture

, 1964

Red, yellow, and blue fluorescent light

2 ft. (61 cm) high 
4 ft. (122 cm) wide

Photo by Billy Jim, New York 
© Stephen Flavin/Artists Rights Society (ARS), New York

A sculpture in red, yellow, and blue fluorescent light by Dan Flavin, titled a primary picture, dated 1964.