A cool article that I came across on digg, the trivia at the end was cool lol. http://www.null-hypothesis.co.uk/article/1352
It also works on teh thought processes by shortening and diverting them. A thought uneffected by any substance makes a pattern akin to a tree...branching off from major themes into smaller ones that relate. Gunja, makes the 'tree' like a bonsai...still many related diversions...but entirely minature.