I sit in the gloomy, almost oppressive environment of the Blumhardt Gallery at the Dowse Art Museum, in which a small but dazzling piece of curatorial handiwork is on display. Beneath me is a bench covered in pale-green vinyl, patterned with spots that are rough to the touch. The surface feels non-slip. It would not be amiss on the floor of a bathroom. I quickly think of urinals and just as...