Strikingly similar designs between two VERY prominent designers...?

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Take a look at these two designs. They look remarkably similar. Both are designs from two very successfull, very popular, and very distinguished designers in the CSS world.

Exhibit A <- Weblog for Sean Voisen.

Exhibit B <- A submission to CSS Zen Garden by Didier Hilhorst. Didier is co-author of [url=“http://www.superfluousbanter.com”]www.superfluousbanter.com.

Just curious as to who inspired whom…