Haiku - It seems like such a simple structure - until you start to write one, that is.
Derived from 17th-century Japanese poetry that was formed as a protest to the elaborate poetic traditions of the time, a western haiku, is commonly a three-line poem consisting of five, seven, and five syllables respectively. It rarely rhymes or has a title, usually has a nature-related motif, and is a snapshot into a wider, untold story - the original soundbite, if you will. There is a serenity and simplicity about them that many find soothing.
A word of warning - These are somewhat different.
Whilst many do retain a link to the artistic side of nature, most catch a glimpse of baser, but no less natural events - those things done by most people, but which usually go unseen by the non-participants. Some are loving, some are coarse and some, of course, are both.