Wittgenstein clarifies the problem of communicating using a human language when he discusses learning a language by "ostensive defining." For example, if one wanted to teach someone that a pencil was called a "pencil" and pointed to a pencil and said, "pencil," how does the listener know that what one is trying to convey is that the thing in front of me (e.g., the entire pencil) is called a "pencil"? Isn't it possible that the listener would associate "pencil" with "wood"? Maybe the listener would associate the word "pencil" with "round" instead (as pencils are, usually, in fact, round!). Wittgenstein writes regarding several possible "interpretations" which may arise after such a lesson. The student may interpret your pointing at a pencil and saying "pencil" to mean the following: (1) This is a pencil; (2) This is round; (3) This is wood; (4) This is one; (5) This is hard, etc., etc.