Poetics (15.12-16.4)

Keep, then, a careful eye on these rules and also on the appeal to the eye[*] which is necessarily bound up with the poet’s business; for that offers many opportunities of going wrong. But this subject has been adequately discussed in the published treatises.[*]

What a Discovery is has been already stated.[*]

These may be congenital, like the spear the Earth-born bear or stars, like those which Carcinus[*] uses in his Thyestes[*];

or they may be acquired and these may be on the body, for instance, wounds, or external things like necklaces, and in the Tyro[*] the discovery by means of the boat.

There is a better and a worse way of using these tokens; for instance Odysseus, by means of his wound, was discovered in one way by the nurse and in another way by the swine-herds.[*]