Installation view of Trialog by Colin Ardley (wall object), Dittmar Krüger (colour box) and Dirk Rathke (Curved Canvas and wall painting); right gallery side; photo: Michael Kutschbach

Installation view of Trialog by Colin Ardley (wall object), Dittmar Krüger (colour box) and Dirk Rathke (Curved Canvas and wall painting); right gallery side; photo: Michael Kutschbach

Installation view of Trialog by Colin Ardley (wall object), Dittmar Krüger (colour box) and Dirk Rathke (Curved Canvas and wall painting); right gallery side; photo: Michael Kutschbach

Installation view of Trialog by Colin Ardley (wall object), Dittmar Krüger (colour box) and Dirk Rathke (Curved Canvas and wall painting); left gallery side; photo: Michael Kutschbach

Rise/Grey Triangle, 2013, 59 x 52 x 28 cm, above detail of wall painting by Dirk Rathke; photo: Michael Kutschbach