A Visual History of Science Fiction

I love maps. Although this (click on the below image at the linked site for the larger versions) is not really a map, it has that same feeling for me - tons of information tightly packed and easily readable. Even if one disagrees with the placement of some works, the illustration works wonderfully to get one thinking about how nothing exists in a vacuum. Except dust bunnies and a guy with an accent mumbling something about cyclones... :)