Here is a fresh poured beer, Another note is that this "Cincinnati Batch doesn't hold a hold for longer than 30 secs (See below for more on head). You can see it fading away through the pics:
Also found this company "Howe Sound" yesterday at Total Wine. They are from British Columbia and have a pretty cool story. Gotta say this is a pretty damn good IPA. Very malty bitter with a nutty sweet finish. Like roasted malt was used maybe: Even the beer is a bit more cloudy.
What is a beer head?
For me: It helps identify the different smells that are inside the beer. It also looks cool. That is about as much as I know about it. If there is to much that is bad to little that is bad.
Below is what Wikipedia calls Beer Head:
Beer head (also
head) is the
frothy foam on top of
beer which is produced by bubbles of gas, typically
carbon dioxide, rising to the surface. The elements that produce the head are
wort protein, yeast and hop residue. The carbon dioxide that forms the bubbles in the head is produced during
fermentation. The carbonation can occur before or after bottling the beer. If the beer continues fermenting in the bottle, then it naturally carbonates and the head is formed upon opening and/or pouring the beer. If the beer is pasteurized or filtered then the beer must be force carbonated using pressurized gas.
The density and longevity of the head will be determined by the type of malt and
adjunct from which the beer was
fermented. Different mash schedules and cereal sources influence head retention. In general, wheat tends to produce larger and longer-lasting heads than barley.
Here is a link to wikipedia if you want to read more about head:
http://en.wikipedia.org/wiki/Beer_head