Signal is an ongoing book series dedicated to documenting and sharing compelling graphics, art projects, and cultural movements of international resistance and liberation struggles. Artists and cultural workers have been at the centre of upheavals and revolts the world over, from the painters and poets in the Paris Commune to the poster makers and street theatre performers of the recent Occupy movement. Signal will bring these artists and their work to a new audience, digging deep through our common history to unearth their images and stories.