Some people are more extrovert than others and some are more introvert. Some people absolutely rely on logic and have no time for emotion, others think emotion and behaviours such a empathy are very important. Putting them all together which brings four combinations. In reality everyone is a combination of introvert/extrovert and of logical/emotional but tend to be predominantly one combination such as ‘emotional/extravert’ , which can be expressed as through the colours red, yellow, green and blue.