Sometimes I don't think we take the ancient prohibitions against making images of God seriously enough. Oh, I don't mean to suggest that there is anything intrinsically wrong with visual images truly understood in a symbolic sense - "fingers pointing to the moon", as it were. I refer mainly to the images we create in our minds - in other words, God created in our own image. Here's something Madeleine L'Engle said about just that:
It isn't always the middle-aged who refuse to listen, who will not even try to understand another point of view. One boy would not get it through his head that for all adults God is not an old man in a white beard sitting on a cloud. As far as this boy was concerned, this old gentleman was the adult's god, and therefore he did not believe in God.