What metaphors are used in The Conference of the Birds by Farid al-Din Attar?

Over the course of the text, Farid al-Din Attar develops seventeen major themes and then describes the topography of the seven metaphorical valleys they must traverse. The sea, for example, offers a metaphor for blind love: one does not see it is full of sharks, its water salty, treacherously sucking down ships and drowning crews.