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  Roaring Lovely August 15, 2015 at 1:52pm

  In the usual space, the location zero is always to be a convention. To extend this analogy to the space of colors, we have to make some perharps strange claim that brightness is only relative! There is also something else different in the usual space. Physicists think that we can always stand anywhere we wish in the universe and then from that point, we perceive every other thing as though we must increas our distance from our point in order to get there. In other language, space is thought to be homogenious, isotropic and symmetrical.
  
  It is abit challenging to extend this analogy to the space of colors. Remember that brightness level is analogous to distance from a region and frequency is analogous to direction. From a given levels of brightness that puts something in a unique point in the space of colors, we can make the thing less brighter by reducing the brightness level. In other words, we don't easily get the idea of increasing the brightness of an object but in the opposit direction as to be different concept from simply reducing the level of brightness.
  
  There are two ways of reconciling this two spaces in this sense. One is to form an idea of negative of frequency. But physiciststs have already accepted that negative of frequency exists! It gives rise to negative of energy when we use Einstein's photoelectric law, E=hf. f=frequency, h=planck's constant, E=energy.
  
  One other way is to reject the idea that space is symmetrical! Universe as a centre that is made of a behemoth gravitating center. There would realy be no such a thing as a negative of distance. This gravitating center will act as point zero in that to move away from it is to ABSOLUTELY increase one's distance. To move towards it is to reduce your distance. Notice that distance increase would be very analogous to increase in brightness of an object. To increase the brightness of an object, you have to add energy to the object. Likwise to rise away from the gravitating centre, you will have to add energy to the escaping rocket.