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The impossible triangle was first conceived by the Swedish artist Oscar Reutersvärd in 1934. Although at first glance it may appear to be a regular three-dimensional object, with each corner looking perfectly normal, when considered as a whole, the paradox becomes apparent. The sides of the triangle look as if they both recede and come towards you simultaneously. Yet, somehow, they meet in an impossible configuration. The drawing itself isn't impossible. Just your three-dimensional interpretation of it.