Ever wonder why people tie shoes together and fling them onto an overhead wire? It seems no one really knows why. There are lots of theories from a symbol of a gang territory, signal for a place to buy drugs, to a celebration of the last day of school or simply throwing up the old pair when a new pair are bought. Or, one person though maybe it was to warn low flying aircraft. These are some ideas that Cecil Adams (Straight Dope column) got when he put the question out. There didn't seem to be any solid answer so he summed it up "It's either a harmless prank, a rite of passage, or a sign of the end of civilization. You figure it out."
Whatever the reason I think the person who hung these didn't want to put them too high in case he/she changed their mind and came back for them.
I used the 24-70 2.8 at 70mm 1/1000 sec 2.8 iso 100