Pedaling through Golden Gate Park the other day, we noticed the conspicuous absence of the giant purple half-head that has graced a lawn near the de Young for a few months. We had all kinds of mean things to say about the head (adolescent pseudo-profundity, like something constructed for a Led Zeppelin album cover), but on the other hand, we smoked enough pot in high school to think, hey, awesome, a giant half-buried purple head with a 1000-yard stare!