When I was a boy growing up in North West PA I was always excited to find an apple or pear orchard where the farmer used the ancient form of Espalier to grow his fruit trees, I suppose because of the regions vast Concord grape orchards, many farmers also used the same type of post and wire system to grow fruit trees.
Here is a picture of a grape farm from my hometown, the grapes are all grown near Lake Erie. You can see the lake in the background of the picture
Here are a few links on Espalier practices:
Of course things of beauty come in threes.
Strike that….. Perhaps in fours.