I saw Frank Chimero's Atlantis World's Fair (pictured above) and thought to myself, this is great. I want one.
I brainstormed how I could apply it to my own website.
Days later, I drew a sketch:
And another one:
A week passed. I woke up feeling pretty good one morning (a rarity) and drew this:
…it ran over to the next page…
After that, it was just a matter of drawing it up in Adobe Illustrator:
Which is almost exactly as it is now.
Several days of HTML, CSS and jQuery ensued. Results here.