Language is like a building: Phonetics vs. Phonology

There is a great analogy over at dialectblog.com explaining the difference between phonetics and phonology:

To illustrate the difference between these two terms, imagine that human language is a building. (Bear with me.) Somebody studying phonology would look at the fundamental structure of the building, its engineering, its shape, its square footage, etc. Somebody studying phonetics, on the other hand, would study the actual materials used to make the building: the particular type of steel, whether it’s brick or wood, the glass in the windows. Phonetics studies the raw materials of language; phonology studies how these raw materials are used.