Verbal and writtenexpression is often taken for granted, as though it magically appeared at some point in time with an already vast vocabulary and set syntax.
Images expand the range of thinking and might yield new kinds of writtenexpression once software makes it easier and more natural to work photos (or the writer's own sketches) into the text.
But as you know, it is in the absolute core of our being as Americans that we allow freedom of expression that is written into our Constitution and is one of our fundamental principles.
As for the claim that exhibitions contribute to knowledge, the practice of having catalogues that cause no offence hastily written by committees usually discourages original research or the expression of controversial ideas.