Today I want to note this one of many murals by Rob “Problak” Gibbs and share some ways it adds to my awareness of what a mural can do. This one can actively demonstrate hand signs for its title when you view it through an app in your device. My post, so far, won’t directly reveal the actions but gives you links to see them or, better yet, go to the wall on Tremont Street at Camden Street, where you can enliven them yourself.