Angel
However, since angels are held to be spirits (that is, non-material beings), medieval theologians were faced with the problem of how humans could see a non-physical creature. Eventually a theory was put forward that angels must make themselves a body out of the nearest thing to the non-physical, i.e. from air. Hence in his famous poem Aire and Angels, the seventeenth century metaphysical poet John Donne uses this idea to write a cynical comment on women, whose love, he says, is like an angel's body of air, while men's love is like the real thing, the angel itself.