Weather, Or Not

I sometimes think that the shelf was the most important invention of the ancient world, after writing. The peoples of Mexico and Peru managed to create advanced civilizations without using the wheel for anything other than childrens toys. I doubt that they could have gotten so far without shelves. And the library is the apotheosis of the shelf. All that thought, so beautifully organized! That is what the digital world needs- some supremely rational and intuitive equivalent of the shelf.