It's always satisfying when the Web version nicely does what the analog used to do, and even more so when there are added features. This interactive Web site from the Museum of Modern Art displays pairs of paintings by Paul Cézanne and Camille Pissaro so that viewers can compare them, in the traditional manner of art history lectures. Some pairs are similar, such as Cézanne's _Still Life with Flask, Glass and Jug_, side-by-side with Pissaro's _Still Life with Pitcher_, or two paintings of L'Hermitage in winter, a neighborhood in the town of Pontoise familiar to both painters. Other pairs are disparate, contrasting still lifes and portraits, that have similarities of technique or color. In addition, thanks to the dynamic nature of the Web site, paintings can be grouped by themes, such as houses and village streets, or techniques (all defined in a glossary): impasto, parallel brush strokes, pallette knife and brush.