Play drive
Play drive is a philosophical concept developed by Friedrich Schiller. It is a conjoining, through contradiction, of the human experience of the infinite and finite, of freedom and time, of sense and reason, and of life and form. The object of the play drive is the living form. In contemplation of the beautiful, it allows man and woman to become most human. To understand how Schiller reaches this conclusion, one must trace the origins of life and form, as a function of the two drives that the play drive mediates: 

the form drive and
the sense drive.