"Mona Lisa Descending A Staircase," a wonderful claymation from 1992

Joan C Gratz's animated short "Mona Lisa Descending A Staircase" is a lovely and trippy 2D claymation of iconic artworks transforming one into another. After spending a decade on the piece, Gratz won the 1992 Academy Award for Best Animated Short Film. Gratz called her animation technique "clay painting." From Educational Media Reviews Online:

Clay-painting is a unique process that blends film and painting, and an innovation that garnered Joan Gratzs Mona Lisa Descending A Staircase a 1992 Academy Award for Best Animated Short Film. In this true landmark of animation, numerous famous and iconic paintings from 20th century art are reproduced as exactly as possible but the transitions between these paintings [are] used to communicate the relationship of artistic movements as Gratz has stated. In the clay painting technique, which I began developing in 1966, I work by painting directly before the camera, making changes to a single painting, shooting a frame, repainting and shooting, etc. In the end there is one painting with the process recorded on film, the product is the process.