In medieval Europe scholasticism mysticism has understood and in that period the interior of a Gothic cathedral became a mystic rapt space. This room was lit by a spiritually-acting light through the stained glass windows: It is in art since the beginning of modernity almost exactly 100 years ago, not more to the pictorial illusion, but the truth in the philosophical sense, better: truthfulness, or whatever you like to express it today with a buzzword: Art should authentically his. In this sense, it has the task to offer us a view of things that is quite different from those of the media, religion, philosophy and science. For this specific artistic vision guiding principle is: "knowledge is grounded in sensory experience"