These are framed clay Strata-cut slices used during the animated 4^th of July segment on Pee-wee’s Playhouse titled “School”.  Strata-cut slices have been mounted inside a frame to protect the clay pieces along with the back of the display being signed by creator/animator: David Daniels.

Pee-wee’s Playhouse is an American children’s comedy television series starring Paul Reubens as the childlike Pee-wee Herman that ran from 1986 to 1990. The show was developed from Reubens’s popular stage show and the TV special The Pee-wee Herman Show, produced for HBO, which was similar in style but featured much more adult humor.

Strata-cut animation is most commonly a form of clay animation in which a long bread-like “loaf” of clay, internally packed tight and loaded with varying imagery is sliced into thin sheets with the animation camera taking a frame after each cut eventually revealing the movement of the internal images within.