A fox comes across a mask anciently used by actors; after an examination, it remarks, 'So full of beauty, so empty of brains!' The Latin version of this, generally shortened to caput vacuum cerebro, then became proverbial. It is recorded by Erasmus in his Adagia, along with its Greek equivalent (Ὦ οἷα κεφαλὴ, καὶ ἐγκέφαλον ούκ ἔχει), with the explanation that it originates from Aesop's fable.[2]