One of the principle metaphors of MeatBall.

	 :	http://usemod.com/cgi-bin/mb.pl?BarnRaising

''From the website...''

	 :	Everyone getting together to help one person out with only the expectation that, if the tables were turned, the beneficiary would do the same for anyone else. 

But there's more to it than that, including the concepts of '''building, collaboration, learning and fun.'''