Without apparent warning, an iconic mural by artist Kent Twitchell depicting fellow artist Ed Ruscha was painted over Friday in Los Angeles. “It’s always been such a popular piece in the art world and in Los Angeles. I had no idea it was in danger in any way. To not be notified, to have it be a fait accompli…. It will take a while for the shock to wear off. It was sort of my ‘Mona Lisa’; I worked on it for nine years.”