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The visual abhorrence is a disregard for normal ordering systems replaced with the horror vaccui: terrifying abuses of space. The clown is terrifying for his costume and false smile's replacing the social order of emotions with its hysteria, used repeatedly in horror genres, and these are the clowns of composition, of space. These are not kind things.
see too: Thomas Bayrle at dépendance, Rob Pruitt at MOCAD