After having two impacted wisdom teeth removed, PKD experienced visions of a religious or past or alternate reality in the months of February and March of 1974 while he lived in Fullerton, CA. He wrote about them in a journal that he titled 2-3-74. Over a decade later, cartoonist and underground comix writer R. Crumb described the event in Weirdo Magazine's Issue 17 from 1986. Crumb's version is well researched and as clear as anything else (including Dick's own writings, which are longer and more profound) about what happened to PKD and what it meant to him. See Crumb’s work below.