We know how to organize things in the real world, whether it's a store, a front page or your kitchen. No matter whether you arrange things alphabetically or by size, you always follow two basic principles: Everthing has a place, and two things can't go in the same place. But, online, those principles don't hold, so we're inventing new ones. For example, a physical photo has to go in one album. But a digital photo of Uncle Bernie on the beach on his birthday can go in as many digital albums as you want -- trips, relatives, beaches, birthdays, funny sunburns, bad comb-overs... And it's not just photos. The new principles for how we organize ideas, information and knowledge are transforming media, education, politics, science, and business - upsetting the old order and the old authorities.