I think this is true.
I spend lots of time taking bucketfuls of dirt out of the ground, and dumping them in trucks. I'm always on the lookout for scrap, or Belgium Block (what we call cobblestones here--dunno if that's what they're called everywhere), or even old bottles. I'd like to think I don't miss much. (Of course, using a 1 1/2 cubic yard excavator bucket to pick up a railroad spike probably isn't cost effective, but hey, sometimes I feel like that's my profit for the day.) Sometimes, I'll walk a site, looking for stuff, and find my head involuntarily snapping to the left or right. That's because I've spotted something out of the corner of my eye, that my brain didn't even conciously recognize...
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