• LA exhibition: Martha Cooper: Remix, in which 50 artists -- including Aiko, Neckface, Swoon, Shepard Fairey (above), Kenny Scharf, and the London Police -- interpret the works of the legendary New York street photographer, on view through May 7 at Carmichael Gallery in Culver City. Via Vandalog.
• Ed Koch, New York mayor (1978-1989), quoted in the book The History of American Graffiti (Harper Design, 2010): "I thought it was disgusting and disgusting on the part of those who supported it. Graffiti was generally supported by wealthy people who said, 'Isn't it wonderful what the animals are doing?' They wouldn't have it in their house! I had nothing but contempt for those who supported graffiti."
• Bob Shaw, author of Helvetica and the New York Subway System, on "the font that took over the world": "It's survived how many mayors, how many heads of the subway, budget crises, graffiti. If you're asking what symbolizes New York, it's not Helvetica. It's how what Vignelli and Noorda did has survived. That's very New York. It doesn't matter that everything around them has fallen apart; it's still there." (Thanks, Linda.)
• Via Rebel Art, the Madrid Street Advertising Takeover.
• Science Friday! "Novelist Cormac McCarthy, filmmaker Werner Herzog, and physicist Lawrence Krauss discuss science as inspiration for art and Herzog’s new film on the earliest known cave paintings."
• The New York Times' Room for Debate asks: Can there be artistic freedom without political freedom?
• In honor of Record Store Day, Apr. 16, "40 Sad Portraits Of Closed Record Stores."