In 1991, provocative Czech artist David Černý painted the Monument to Soviet Tank Crews, a memorial at Prague’s Náměstí Kinských (Kinský Square) that for many represented the tank-led Soviet invasion of the country that crushed Prague Spring in 1968. For this radical act of art, he chose a shade of bubblegum pink. Černý was arrested for the act and the paint was removed, but the tank was painted pink a second time by members of the Czech parliament in protest. It’s been pink ever since, and has become one of…