Cezanne sketches found on reverse sides of watercolors

Philadelphia museum says it has discovered two unfinished sketches on the reverse side of two watercolors by Cezanne — and officials say even their collector was probably unaware of their existence.

The Philadelphia-based Barnes Foundation said the sketches — one graphite and the other watercolor — were found during conservation work on the reverse sides of two Cezanne watercolors depicting the landscape of southern France.

Officials said in a statement that the sketches haven’t been seen since at least the early 20th century, “most likely prior to Dr. Albert Barnes’s purchase of the works” in 1921.”

The works will be displayed in double-sided frames allowing viewing of both sides in April and May, after which the works will be returned to their original locations.