Poster image courtesy of DayGlo Color Corp. This article is part of our exploration of design and psychedelia. Pick up a copy of Eye on Design #02, the “ Psych” issue, for a deeper dive on the topic. DayGlo was born in the dark. It was 1933, and as lore has it, a young Bob Switzer (one of DayGlo’s inventors) had gotten a head injury while working his summer job at a H. J. Heinz Company tomato quality control laboratory in Berkeley, CA.