This nighttime scene is warmed by the glow of the gaslight. Can’t you hear the banter from the saloon? Maybe a good story about the gold fields or perhaps that trip around the Horn.
Now look what he does with the moonlight. It not only highlights the water but the muddy ground of the man-made waterfront. You can see the tops of the pilings that were driven into the bottom of the bay and filled with earth. Stobart took the gas light and moon light and joined them to recreate this vanished scene.