15 x 25.5cm, 4pp plus 1pp insert. Gallery brochure on card and invite card announcing this solo exhibition by Von Graevenitz. Two works reproduced in black and white. Short biography and exhibition history and list of works exhibited. Towards the invisible I was the first of two group shows at the gallery intended to promote contemporary abstract art in Britain.

Works by Lygia Clark, Sergio De Camargo, Alejandro Otero and Jesus-Rafael Soto were included and there is a single b/w image of Lygia Clark's installations. Signals was an influential gallery often concentrating on kinetic - optical art and the Zero group. Short text by Richard Widdening in the gallery and future events.