Installation artist Chris Cobb reorganised an entire secondhand book store by spine colour.  He had about 20 people helping, together they colour-coded around 20 000 books overnight.  Check out the rest of the amazing photos here.  Thanks to the power of Google, I found an interview here, and more information here.

I kind of want to do this to my books just to see what it would look like, but then I’d never be able to find anything.  (Plus I’d take it way too seriously and stress out about whether a book counts as this colour or that – alphabetizing is much less complicated!)