Directional interconnect cables


I see several big-name interconnect vendors mark directional arrows on the outer jacket of the cables.

How is it that a wire can be directional? It's a simple electrical conductor, how is it possible for it to be directional, to sound "better" when connected in one direction vs. the other? This does not make sense to me, perhaps someone here can explain how this can possibly be so...
lupinthe3rd
trust cable companies - they certainly know more and have more experience.

I am sure you can trust many of them, however, I would be cautious about their vested interest in selling higher margin products. And a $400 audio or video cable is likely a much higher margin product than say the latest competitively priced big ticket item such as a plasma HDTV or a speaker. Let's not be totally naive about the fact that these companies actually sell these things for a profit. There are probably very few who sell cables as a service to humanity because they "know more and have more experience".
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Shardone - Of course not to trust them completely but don't expect evil doing either. When I bought my car I trusted manufacturer - (profit oriented too).

Everybody is expecting conspiracy from cable manufacturers at different level. Is 9N copper or 7N silver necessary, what about zero crystal process? Is capacitance of 5pF or inductance of 40nH per foot necessary. Or complicated winding technics to lower skin effect in speaker cables. What about lowering dielectric constant by using oversized foamed teflon tubes? To many all of the above is snake oil and lamp cord from Home Depot is just fine. Whatever!
Crown on the rocks please...... No, wait, make that neat..... and a double.....