In 1991, the notorious Czech bad boy sculptor David Černý vandalized the public “monument” Soviet Tank No. 23. The “monument” tank had been plopped in Prague in 1945 by the Soviets after liberating Czechoslovakia from the Nazis, but since the Soviet-led invasion, for decades, it had meant something entirely different, something tyrannical. Černý painted it a bright, waxy pink and topped it with a giant, poking finger, rendering the symbol of military oppression completely absurd and comically phallic. A year ago, to celebrate the 20th anniversary of the withdrawal of Soviet troops from Czechoslovakia, the pink thing was triumphantly sailed down Prague’s Vltala River. Prague still loves it.