Plato, Parmenides, Philebus, Symposium, Phaedrus, Παρμενίδης 110:

εἰ οὖν τι, ἔφη, ἐοίκεν τῷ εἴδει, οἱο͂́ν τε ἐκεῖνο τὸ εἶδοσ μὴ ὅμοιον εἶναι τῷ εἰκασθέντι, καθ’ ὅσον αὐτῷ ἀφωμοιώθη; ἢ ἔστι τισ μηχανὴ τὸ ὅμοιον μὴ ὁμοίῳ ὅμοιον εἶναι;