First, a Quiz

Have a look at the beer at right. The photo isn't the greatest; I took it with my cell phone. Nevertheless, it should be functional for our purposes. Now, upon visual inspection alone, identify the style of beer. (That blurry quality on the bottom half of the glass is condensation, not haze.)
1. German pils
2. Saison
3. Kolsch
4. Abbey ale
5. Pale ale
6. Imperial stout
I'll give you a hint: it's not six.

Click for the answer.