It's a blob

Since the notion of a point seems to preclude internal complexity, a more helpful metaphor would perhaps be to say that the perfective reduces a situation to a blob, rater than to a point: a blob is a three-dimensional object, and can therefore have internal complexity, although it is nonetheless a single object with clearly circumscribed limits.—Aspect, page 18

<idle musing>
You've got to love a linguistics book that calls the perfective aspect a blob!

And, actually, the book is very readable—and concise. It's not even 140 pages, just a bit longer than his book on Tense. Refreshing! Especially after struggling through almost 400 pages of a cognitive linguistics book that in the end could have been 150 pages...<sigh>
</idle musing>