Interconnects, some have directional indicators, why?

So here comes the obvious question: Do all "directional" interconnects terminate at the amplifier - arrow pointing to the input of the amplifier?

So, this begs the question: will the sound improve if the amplifier is placed lower than the source components so the electrons could travel more freely down hill following the direction in the cable? This might explain why most serious audiophiles put their amplifiers on the lowest shelf on the rack. Just wondering...