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Impossible object

Is a type of optical illusion consisting of a two-dimensional figure which is instantly and subconsciously interpreted by the visual system as representing a projection of a three-dimensional object although it is not actually possible for such an object to exist (at least not in the form interpreted by the visual system).In most cases the impossibility becomes apparent after viewing the figure for a few seconds. However, the initial impression of a 3D object remains even after it has been contradicted.

shelly moreau's profile photoErnest Clark,Jr's profile photo
i saw a show on this not to long ago and i'm still haveing trouble wrapping around that ideal cause everything has hieght, withe and length so how can everything be made only 2d ???