It makes more sense to me to send energy into the mandala picture to the reservoir, too, or maybe there can be a separate mandala to send reiki to? It isn't that I can't send reiki to a general idea like a reservoir in the sky. It is just simpler to provide a picture so that everyone can work together more easily, with the same concept of a reservoir in the sky. Why else would we need a picture to receive the reiki through?