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The sadness and happiness are the two extreme conditions that we are most familiar with. Shyness, fearfulness, boldness, jealousies, states of anger and mercy are the other similar categories of the same effect such as different colours of light, different kinds of taste, different types of smells and different range of temperatures. We can measure temperature and can also explain the colours with relation to different frequencies of light. We can't explain remaining categories by any scientific system. But, our consciousness has been already programmed to perceive these conditions in a unique way. The blueness, redness, yellows and other colours are the ways in which we recognise different frequencies of light. We don't have any explanation as to why a particular colour is associated with specific frequency of light. Why blue can't take the place of red? Do all people conceive blue colour in exactly the same manner? May be some people are seeing red as blue but they have learnt to call it blue. We can't give any explanation to several such questions. We have been programmed to perceive different types of vibrations in the form of colours, tastes, smell, warmth, happiness, sound, shyness, fearfulness, jealousies and variety of other moods. From our non-materialistic state of comprehension to the vast universe, the complete system is working on the principle of vibrations and periodic motions.