It's all in the details. Why do door handles need to be symmetrical? In fact there may be good reasons to have them different -- perhaps to invite visitors to use one side before the other. But in this case it looks like it's simply a sign that one can purchase a replacement part of one type but not the other. In other words one side is more repairable then the other. Much of street use is repair work. And sometimes repair work is improvement. A good question surfaces: with this repair is one side of the door now more usable than the other? If you came upon this unequal set, which side would you reach for? Thanks to Splintered*Light for posting this on Flickr.