But it seems like there are other ways to detect them. [Kaneki indicates the ectoplasm-whatever-the-heck machine again.] Can you see them with the naked eye? I mean...I've never seen one, myself, but I don't really if that's because I can't or because I've just never encountered any or because they don't exist or what.

[He'd normally lean toward "don't exist" but for the sake of the conversation, he won't go there.]