The sky is not blue

There is no denying sky, ocean, and thick ice, are blue. Stare up to see the azure sky broken only by the white of clouds. Yet measure some blue air, ocean, or ice, and you will find not one molecule of color in it. Should we conclude what we see is wrong because we have measured proof there is no blue contained in air, water, or ice? Should we not trust our eyes or ears when we sense that which measurements prove wrong? We know, of course, the blue of air, water, and ice comes not from embedded color but water molecules stripping out reds and yellows so only blue remains. You need a lot of molecules to filter enough pigment, which is why small bodies of water are transparent and thin ice is white. When it comes to analyzing what makes cables sound different it's best to start with as few preconceptions as possible. Famed engineer Dick Burwen takes a stab at why we hear differences that cannot exist and you can read about them here. Dick cannot believe power cables feeding regulated supplies make sonic changes - and he's right that it makes no sense. Where he and I would disagree is the conclusion he then draws - one that dismisses differences in cables and ascribes them instead to the measurement methodology. He goes on to state some very accurate observations about the pitfalls of using our ears as measurement tools. I would agree with him on many points. Because there is no blue in air, because power supplies shouldn't be affected by power cords, does not mean our observations are wrong.