The wall and the fence

Museggmauer - the great rampart walls were built along the northern edge of the city of Luzern, in 1386. I was following a popular tourist walking path along the city, which took me up one of the towers of the wall. I walked over the fortification for some time. I walked past several towers on my way and descended from one tower to the outer side of the city. There was this walkway going around the rest of the wall, back into the city. I was trying to take a nice photo of the fence and the green field beyond, when suddenly the fence gave me an electric shock, as I accidentally touched one of its cables. On one hand there was this great & modest wall that may have retaliated the attacks of big armies, literally letting me walk all over it; and on the other hand, there was this petite & impudent fencing. Doesn't this remind you of Aesop's fables?