While looking at the Human Clock, I decided (seemingly like a lot of people, including the author) to look at the filenames of the graphics, with the thought of perhaps "leveraging" them. He knew we were coming. This is in the source of the page:
  Welcome to the source code for this page. Not much here.
The picture filenames all took a one-way trip to MD5 city to mask their true identity
(if that is what you were looking for).

Since you are here though, we might as well tell you a joke since you
took the time to look at the source code and you shouldn't have to close this
window empty-handed.

q: Why did the turkey cross the road?
a: It was the chickens day off.