What do we call visible light? We call it color. But the electromagnetic spectrum runs to zero in one direction and infinity in the other, so really, children, mathematically, all of light is invisible.
I think often we get sidetracked around the public responsibility of the poet. We don't spend a lot of time talking about the private responsibility of the poet. Which maybe we should. Very recently, I had my thesis students start "required daydreaming." They have to sit there and daydream. And they can't do anything else.