Generate text that refutes this claim: The power of the visual  Art differs from other forms of media with regard to the expression of ideas. Unlike other methods of conveying ideas, art has a visceral impact that is instant and has a lasting effect.  In a discussion, for example, there are often clues that ideas that might make people feel uncomfortable are about to arise. Thus, people are in a better position to consent to the sorts of challenges controversy within a conversation may pose (similarly, we tend to look more positively on taboo subjects raised within a conversational context than we do when they are, for example, shouted about in the street).  In the case of art, particularly that which is displayed in public spaces (like squares, parks and museums) people are unable to consent in this way, but rather, may be confronted suddenly by something that they find disgusting, because it has forced them to confront something they find horrific or traumatic, in a manner which has a great impact, and that, because of the power of the visual, they find difficult to forget.
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We are no less able to consent to art than we are to every other manifestation of individuality in society. We are similarly unable to consent to, but strongly impacted by, all sorts of things, from music videos and adverts to people dressed strangely on the street.  However, as a society we accept that people’s core values ought to be robust enough to survive challenges in the public sphere: we allow debate, art and music on many topics that have enormous personal ramifications, from euthanasia to deportation.  As a consequence, it is only legitimate to restrict the worst excesses, whose impact can be measured objectively, before display: we set rules in this regard restricting the worst instances of, for example, exploitation and pornography.  Further, those who are worst affected can self-limit their exposure: it is rare that people are entirely unaware of the existence of a controversial piece of art, and as such people can choose not to view it, or to view it only briefly. They should not have the right to prevent everyone else from seeing such a piece.