I have heard

Cf. Inferno, XXXIII, 46: "ed io senti chiavar l'uscio di sotto / all'orribile torre." T

Also F.H. Bradley, Appearance and Reality, p. 306: "My external sensations are no less private to my self than are my thoughts or my feelings. In either case my experience falls within my own circle, a circle closed on the outside; and, with all its elements alike, every sphere is opaque to the others which surround it.... In brief, regarded as an existence which appears in a soul, the whole world for each is particular and private to that soul." [Eliot's note]