THE PHYSIC, BIOCHEMISTRY AND PSYCHOLOGY INVESTIGATIONS ABOUT THE COLORS HAVE GIVEN AWAY VERY INTERESTING THINGS. THE OPINION THAT COLORS ARE A LUXURY FOR NATURE CAN’T BE PROPPED UP BECAUSE IN THE FIRST PLACE SIGHT ISN’T THE UNIQUE SYSTEM THAT PERCEIVES CHROMATIC BRIGHT VARIATIONS WITHOUT ANYBODY CAN SEE THEM. FOR EXAMPLE YELLOW MADE MOVE UNCONSCIOUSLY THE ARMS, RED ATTRACTED THEM AND BLUE REPULSED THEM. SO WE CAN CONCLUDE THAT CHROMATIC SENSATIONS NOT ONLY GET INTO THE BODY FROM THE BIG WINDOW OF THE EYES. IT MUST EXIST OTHER RECEIVER SYSTEM LOCATED IN THE SKIN. SINCE A LONG TIME AGO THE BLINDS PEOPLE CAN DETECT VIBRATIONS OF THE LIGHT BETTER THAN PEOPLE WHOM CAN SEE PERFECTLY, SO WE CAN SUPPOSE THAT VIBRATIONS IS NOT ONLY PRESENT IN THE SENSITIVITY, THE RESPIRATORY RHYTHM AND THE BLOOD PRESSURE BUT IN MUCH MORE FACETS THAT WE CAN IMAGINE.