‘Which way up?’ and ‘What size?’ are recurring questions when viewing the artworks of Tom Ellis. Devices of reflection and re-scaling are extracted from an architectural context and employed with quirky irreverence in this exhibition of models, drawings and ready-mades. Even before his collaboration with architects for this latest show, Tom Ellis' work has shown a fascination with imagined places and structures. Earlier pieces construct, in cheap, clumsy materials, the inaccessible landscapes viewed from a plane window or the envisaged destination of a journey. His explorations of the perceptual effects of scale are sometimes jokey, sometimes profound, but always refreshing and unpretentious.

La Congiunta, Peter Märkli's house for sculptures in the Leventina valley, is an enigmatic concrete structure. It has the appearance of a large rock, its density strengthened by a complete absence of visible openings. No hint is given of its content or its entrance. And so our curiosity impels us to explore the block's exterior. The horizontal divisions of the shuttering create at a glance the impression of large stone slabs. On closer viewing, the individual boards and the grain of the timber are revealed as traces of construction. Our understanding of the volume develops gradually, through contact with its material qualities.