User blog comment:Lenopow/Portal 2 Easter Egg - Creepy Message/@comment-66.87.121.198-20140608220338

Remember he is crazy, he could be talking about how GLaDOS is able to see almost anything within the lab, but she has no eyes only camaras or sensors or just other machines to see. But since he is referring to himself he might be referencing the way his Schizophrenia affects the way he sees things, for example in the lab rat comic his companion talks to him and directs him, so he might be talking about his cube