Paper is a wonderful technology for the storage and retrieval of observations. Five hundred years later, many of Leonardo’s notebooks are still around to astonish and inspire us. Fifty years from now, our own notebooks, if we work up the initiative to start keeping them, can be around to astonish and inspire our grandchildren, long after our tweets and Facebook posts have been forgotten.

—Walter Isaacson,
The Lessons of Leonardo: How to Be a Creative Genius
(via Austen Kleon)