Pioneering the clay painting technique was one-time Will Vinton Studios animator Joan Gratz, first in her Oscar-nominated film "The Creation" (1980), and then in her Oscar-winning "Mona Lisa Descending a Staircase", filmed in 1992. Another Vinton animator, Craig Bartlett, developed a technique in which he not only used clay painting but sometimes built up clay images that rose off the plane of the flat support platform toward the camera lens to give a more 3-D stop-motion look to his Hey Arnold! films.