The Discovery of CLAY Therapy. Play therapists communicate with children through the medium of toys. Blocks, dolls, puppets, vehicles, and of course, modeling clay. Children are naturally attracted to clay. Most have grown up with modeling clay at home and school. Children like clay. If children don't have clay they will play with pie dough, mud pudding, ice cream or mashed potatoes. They like feeling, molding, squishing, rolling and pounding clay. Counselors use clay because it helps children explore developmental milestones and express fundamental emotions. In spite of their artistic skills, age or experience. In spite of their lifelong denial of artistic ability. In spite of their deferences that keep them from even wanting to try.