This morning we went to the Deer Isle weekly farmers’ market. In addition to stalls offering local produce, eggs, dairy products, and meats, there also are stalls offering crafts and handmade goods — like the one that sold these spoons.

As I walked by, I was struck by this pile of left-handed spoons. There was a similar pile of right-handed spoons, as well as spoons that were agnostic on the preferred hand issue. I thought it was a joke — like the old prank about telling a gullible kid that he needed to go find a left-handed screwdriver– but the earnest young woman selling the spoons made clear it was no joking matter. Getting the right spoon to match your “handedness” is extremely important, she said.

It seemed strange to me — but then the whole concept of “handedness” seems pretty strange, too. Human beings are studies in bilateral symmetry; we have two arms, legs, hands, feet, eyes, ears, and nostrils. We don’t typically think of people as having a dominant leg, or ear, or nostril — so why do so many people have a dominant hand? About 90 percent of humans are right-handed, 9 percent are left-handed, and only the remaining 1 percent are truly ambidextrous.

That means, of course, that the market for left-handed spoons is a lot smaller than the market for right-handed spoons. But why should we have a dominant hand at all?