I compare the scale of these dramatic rain clouds to the tiny figures of the tourists on the boardwalk below them. The tourists are silhouetted, which reveals form instead of detail – there is ample variety in their posture and gait, particularly in the man at far right who incongruously seems to be crouching. (Perhaps he, like me, is making a photograph.) The steam rising from the thermal pool behind the people defines their silhouettes by isolating them from the dark background. The hill at right is lined with dead trees – the residue of the 1988 Yellowstone fires – adding a surrealistic touch to the scene.