Suppose, for example, that John built two houses. Then each of the two building events can be described as "built a house". But the building of the one house isn't, and indeed "cannot" be thought of a proper part of the building of the second. This contrasts with states describable as, say, "walk around aimlessly". If John walked around aimlessly for two hours, then there will be many proper parts of that, that last, say 10 minutes, or 1 hour, etc. which also can be described as "walk around aimlessly". Thus, for "walk around aimlessly", there will be many choices of x and y, such that both can be described as "walk around aimlessly", where x is a proper part of y. Hence, "build a house" is correctly characterized as telic and "walk around aimlessly" as atelic by this definition. Quantization can also be used in the definition of count nouns.