A mirror is simple. It has no shape or image of its own. If it did, it would not be able to reflect the image of other things. Simplicity is what makes a mirror a mirror.
Beyond our world is an Infinite Light, the origin of all that is. Relative to our world it is a nothingness. So simple and void, we feel as though we have no source at all. So formless, it is able to reflect whatever form we choose to show it from below.
Try it. Look up and celebrate. The heavens will celebrate along with you.