A brand name ("a trademark owned by the Bluebird Toys group of companies") for a modeling clay (oil-based as opposed to ceramic water-based clays) is available in many colors. It cannot be fired or glazed. It softens as it is modeled by the hands (because of their warmth), pieces being joined to each other by pressing them together and blending with fingertips.(pr. PLA-stə-seen)Also see polymer clay.