claypainting
n.β Β«[Joan] Gratz pioneered the animation technique known as “claypainting.” Working with bits of clay as if they were oil or acrylic paint, she blends colors and etches fine lines to create a seamless flow of images.Β» ββFemale authors and filmmakers share spotlight on local radio” Daily Astorian (Ore.) Aug. 18, 2005. (source: Double-Tongued Dictionary)