How 'projection bombing' blew up on Twitter HQ

From Gail Porter being beamed on to parliament to #refugeeswelcome lighting up the cliffs of Dover, this nifty visual trick has become a go-to viral hit for activists. As Twitter boss Jack Dorsey can confirm, it’s simple, eye-catching – and you can’t rub it offBy the standards of a guerrilla artform with unlikely roots in Cool Britannia, the latest example was modest, if direct. On Tuesday night, an activist group in San Francisco projected a brief message on to the walls of Tw