According to Tolstoy, art must create a specific emotional link between artist and audience, one that "affects" the viewer. Thus, real art requires the capacity to unite people via communication (clearness and genuineness are therefore crucial values). This aesthetic conception led Tolstoy to widen the criteria of what exactly a work of art is. He believed that the concept of art embraces any human activity in which one emitter, by means of external signs, transmits previously experienced feelings.