The sun doesn't apologize for shining so bright, just as the moon shouldn't apologize for needing its light.
Sometimes you are the one that is shining for those around you, you are in a good place and doing what you can to make others happy. Other times you need that light from other people, and that is okay. It is more than okay, that is what we as humans are meant to do. We were never meant to wander this earth lonely or helpless. A poster reminder to shine when you can and accept the shine when you need it.