This cable directionality stuff kind of reminds me of the true story told of Nils Bohr, the great Nobel Prize winning physicist.

Above the front door of his country cottage in Tisvilde, Bohr had nailed a horseshoe.

An American physicist was visiting Bohr's house and, seeing the horseshoe said: "Surely you don't really believe the superstition that a horseshoe brings luck?" "

"No", answered Bohr, "Of course not. But I understand that it works whether you believe in it or not".