A sub variation clay animation can be informally called "clay melting". Any kind of heat source can be applied on or near (or below) clay to cause it to melt while an animation camera on a time-lapse setting slowly films the process. For example, consider Vinton's early short clay-animated film "Closed Mondays" (co produced by animator Bob Gardiner) at the end of the computer sequence. A similar technique was used in the climax scene of "Raiders of the Lost Ark" to "melt" the faces of the antagonists.