Lawrence Alma-Tadema painted marble better than anyone who has ever lived. The cool translucence of Pentelic and Carrara stone, the way light passes through alabaster, the specific warmth of Cipollino against the blue of the Mediterranean sky — these qualities are rendered in his canvases with a trompe l’oeil precision that makes the painted marble appear to be the thing itself. This is not a small achievement. It is also a precise description of what his paintings of ancient Rome accomplish and where their limitations lie: extraordinary on the surface, and the surface is the point.