Polymorphics are materials that are able to dynamically respond to stimuli. Also known as "intelligent materials", they first appeared in the 19th century in the form of the piezo-electric crystal that generated electrical fields when exposed to heat or to stress. This work only exploded in importance in the 21st century. Controlled by a microprocessor, Polymorphics acted as muscles - contracting against unusual stresses - and surpassed the strength of their predecessors many times over.