A glossary of purple: 1) Purple Protest. Anti-apartheid protesters in South Africa thronged before a water cannon spraying water dyed purple. Stained for arrest but emboldened, they chanted, “The purple shall govern.” 2) Purple Prose. An insult Horace coined to mock the treatment of language as stuff, both sense and sensuousness. 3) Electric Purple. Psychedelia’s purple, of Deep Purple, Hendrix’s Purple Haze and Prince’s Purple Rain, of LSD as narcotechnology, of a countercultural history that seesaws between the French Revolution and the New Age movement, the Culture Industry and Silicon Valley. What should we do with this aging body of knowledge? Pumice the heel. See what collects in the tub.