The Waterfalls at Tivoli by Joseph Vernet

This is Claude-Joseph Vernet's The Waterfalls at Tivoli, painted in 1737 and held at the Cleveland Museum of Art. Vernet was the leading French landscape painter of the eighteenth century, and his speciality was considered nearly impossible: rendering falling water and atmospheric vapour in thick, slow-drying oil paint.

Look directly at the base of the main cascade. The water transitions from crisp white foam into a soft, luminous mist. You are not looking at opaque white pigment. Vernet built the effect by pulling thin, translucent veils of grey and brown across the dark rock beneath it, letting the ground-layer show through. That is what makes it read as lit smoke rather than solid paint.

Vernet painted this at twenty-three, early in a long career that would make him famous across Europe. Tivoli's falls were a Grand Tour pilgrimage site, every wealthy traveller knew the view, but few painters could capture the vaporeux atmosphere the way Vernet did. Visitors who had watched real water dissolve into the gorge saw his version and knew the trick had worked.

The mist is the painting's signature, but it is also a question of patience. Wet-on-wet dragging at that scale leaves no room for correction. One pass had to be right.