Everyone knows Leonardo Da Vinci wasn't normal. The man wrote in mirror image (backwards) for heavens sake. You can find some of his works on a new website at http://ttpdownload.bl.uk/. I particularly like the study on reflection of the moon and earth. If you hit the M key while looking at the Leonardo Da Vinci Codex Arundel, it will flip the text to a more "normal" view. Experiment with the magnifying glass. Very very kewl indeed.
There are some other rather fascinating works there as well. For more background on the project, see http://www.turningthepages.com/.
One last question... was Leonardo di ser Piero da Vinci the greatest painter of all time?