Van Trier claims that light and its associated information transmits through the whole universe but ignores that most of that light and information is lost somewhere in between. You do not connect with a distant monument by pointing a smart phone's led flash at it, billions of failed night photos prove it every year. Once you take that huge loss of information into account, that ethereal quality of light quickly disappears, and your philosophical view of light changes inevitably (or should at least).
Because of this omni directional property, our inability to mask it or focus it, we can not "see" it (in the way of images) but very much sense it (see vestibular system). Funny thing is lots of people get sea sick if these two senses disagree in what they "see".