Art is one of our methods for trying to understand the universe, and to express ourselves within it. Art is a defining characteristic of intelligence, in my eyes. At the least, art should be something aesthetically pleasing. At its utmost, it provides a perspective and an understanding for people. Sometimes it also serves a very pragmatic purpose, such as a building or metro system.

I don't know if I could really choose some art I love more than others, though I have a fondness for architecture. It just feels that if, for instance, I name music, I overlook literature.

I do have a fondness for architecture though.

http://upload.wikimedia.org/wikipedi...eep_Towers.jpg
http://upload.wikimedia.org/wikipedi...skayaKL-mm.jpg

And what I really love is when an art movement has impact in many media forms. Art Deco comes to mind;
http://upload.wikimedia.org/wikipedi...Hall_-_001.jpg
http://upload.wikimedia.org/wikipedi...door_sedan.jpg
http://popsci.typepad.com/photos/unc...07/08/22/1.jpg

The one thing I really love about BioShock is how it uses Art Deco and how much it adds to the game. I'm hard pressed to think of a better setting; the best I can manage is an alternative equivalent, basically an art movement which espouses technology, efficiency, etc. I do so wish games would take their art direction cues from other sources. There is a distinct absence of, say, Socialist Realism as an art style.