Glupson is touching on how I feel about it. Not only would I not like to stare at fishing lines holding cables across my listening room (I apologize but I was being sarcastic about the fishing line weight), but I would also dislike looking at wires the size of water hoses laying across the floor everywhere on top of ceramic or whatever supports. Just me, but my listening experience is a balance between the sound and the visual. If it looks like a mess, I will feel like a mess. If it looks good, I will feel good even if I don't get that top few percentage point in sound quality. To each is own.
How much space between cables is enough?
I understand that proximity between power cables and interconnects or power cables and power cables is a problem, but is there a rule of thumb as to how much space is required to NOT be a problem. 1/2", 1", 6"? Also, are all cables the same? I would assume that the higher the current, the more isolation, but belief and reality are seldom the same.