Protagonist of the documentary is the clean air on the Umbrian hills, which provides a backdrop for the choices and the life of St. Francis of Assisi, and which inspires the harmony of full and empty spaces, the clarity, and the pale light of Pietro Perugino, and which is host to the play, challenge and vertigo of the hang-glider on the Appennino plateau and where a kite's dream is controlled by a thin thread on the grasses.