Initially, being entities with new consciousness, they were very friendly with each other. They both knew when it was time to sleep or to be awake, and they decided to create a mixture of light and darkness that served as their communication space. To get a perfect mixture of light and darkness, they both had to decide on a measuring instrument while looking at each other's characters, such as how Light travels in a straight line, while Darkness travels in an uneven, scattered manner.

Light informed Darkness that the period it can light the way would be called Day, while Darkness also informed Light that the period it can spread darkness would be called Night. Light gives a sense of direction, and that is why all paths or directions need light for visibilty (both physically and mentally). While Darkness brings about a state of nothingness, as nothing can be seen.
Light and darkness are in constant motion, trying to find balance. However, their understanding of each other is what has kept them this far.
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