If I would give a visual shape to the quality of Unity, I think this would be it. The way the colours work together and fade into one another brings me a sense of completeness. It reflects balance between warm colours and cold ones. Between passion and serenity. Between the masculine and the feminine.
 
When someone asks me what my favourite colour is, I wholeheartedly say 'rainbow!', because seeing all colours of the spectrum working together gives me a soothing feeling. It brings me peace and reminds me that everything is okay.