Difusor is a group of Barcelona-based “artivists” who stage guerilla projects in the public space. They recently improved an old decaying bunker from the Spanish Civil War by covering it with pink camouflage. (The bunker was already covered with graffiti, as seen here.)
They write:
Difusor has been trying to improve public space in the Barcelona area, developing different kinds of projects. Recently we (re)visited an abandoned Spanish civil war republican bunker. Our merge between war and absurdity.