1970. Critchlow and Alan Hacker. Sound in Space. Edinburgh College of Art.

August 1970. Unidentified group at the platform for Keith Critchlow and Alan Hacker's 'musical environment' Sound in Space (25-29 August) presented by the RDG in Edinburgh College of Art as part of the 1970 Edinburgh Festival Fringe (contemporaneously with Strategy: Get Arts). The performance took place within a structure designed by Critchlow, part of which is in the foreground. Photograph by George Oliver.