Both the works of art and the theoretical concepts are forms of knowledge based upon the hypothetical nature of our knowledge about reality. For reflective learning, the importance of works of art and theoretical concepts lies in the fact that they are spaces for development of thinking; they are never objects, results or drilled routines, methods and techniques. They are spaces for development of thinking in a special way: the subject will be able to think himself or herself. Drawing on an empirical research project, we shall inquire into following question: In what way is the sphere of the hypothetical or, the thinkable or the possible a space in which the human being can unfold his existence as a free and active being, potentially infinitely capable of development?