Arturo Di Stefano's latest series of paintings is called Cangiante, and like the title of his last show at Purdy Hicks Gallery, Fat over lean, the title refers to a painting technique, in this case one that dates from the Renaissance, in which a different colour rather than a darker hue was used to suggest depth to a given form. Cangiante derives from the Italian word Cangiare: to change. It also has other connotations pertinent to the activity of painting: iridescence; simultaneous colour contrast; optical glare and so on.