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I thought of that plaque recently when I started to come across earth-bound vehicles, usually minivans, sporting decals that show humans in stick-figure fashion.  Here’s an example:

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Just as with Pioneer 10 and 11, these markings are intended to convey a basic message: “Behold the animating forces behind this vehicle.” But — fearful thought — what if these decals survive for millennia, long after we’re gone? Won’t these drawings confuse the hell out of alien archaeologists who come to study the earth? Will they think they’ve come upon a planet once dominated by creatures lacking fingers, toes, and noses? Where most inhabitants were fond of decorated discs, and a few others wore belts of tree mushroom fungi?

As for the here and now, you can find a lively discussion over at the Mother Proof blog, where blogger Emily Hansen’s post (“Banish Stick Figure Decals!”) inspired an 18-month-long trail of comments, pro and con.  Anti-decal sentiment is strong.  This fad may fade.

Aliens will be grateful.