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.
128x128tony1954
Do people really want to be in the room with cables floating in the air hanging on fishing lines?
It makes vacuuming so much easier...

"It makes vacuuming so much easier..."

"Hmmm, what is that in that ceiling corner? Spider web or my speaker cables? I'd better be careful when cleaning."

I coil mine around the water heater much differently.  I go from top to bottom, and it must be a minimum of three wraps.  Phenomenal difference!  Enlightening to the Nth degree.  

Though I am kidding, of course, somebody might actually try this.  Oh, what have I done?

 Honestly though, have a good time and just maintain logic, i.e., don't run the power cables close to and/or in parallel to any signal cables.  By all means, enjoy the music.