You cannot checkmate with only a bishop, but you can checkmate with only a rook:
Thus, rooks rule, bishops drool.
Wow, Parag, you have a sharp eye. We arranged the pieces in order of height -- you could say we prioritized visual impact over strict adherence to the relative power of the pieces. I think it works well as is, but thanks for pointing this out. It's good to know eyes are on us!! :-)
Modified title of discussion because the same can actually be said of rooks versus knights. Hence, knights also drool, but their drool tends to be splattered all over the place.
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