My problem began with placing a candy bar on the first shelf of the kitchen pantry (I hide my chocolate there because my wife, Princess Buttercup, goes cuckoo for cocoa). A few days later, I went in search of my candy bar. It had (mysteriously) migrated to a lower shelf (apparently, that's where Buttercup hides her chocolate). I never saw it. I see, but eye not see. Despite looking at all three shelves, I simply couldn't see what was clearly there to be seen on the middle shelf.

Fortunately, there's nothing lethal about a candy bar that escapes notice. Calorically, I was better off to not-see and avoid. You can't say the same if you fail to notice a crack in your propeller, nearby airborne traffic, or objects on the runway during landing. Now you understand my concern about the invisible candy bar.

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