If Fiona Banner, by virtue of using language as her primary material, is associated with conceptual art, that's only the start of things. She has understood the physicality and visuality of words in the gallery over the cerebral. It has taken art 30 years, since conceptualists first put words on a wall, to work this one out. And in a similar way, Catherine Yass is testing what film and photography can do. You can see the points of influence in the work - whether it is Jeff Wall's lightboxes or austere German photography - but she has loosened up the received ideas, allowing the pleasure of the aesthetic back into the frame.