An impossible object (also known as an impossible figure or an undecidable figure) 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 geometrically 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. There are also more subtle examples of impossible objects where the impossibility does not become apparent spontaneously and it is necessary to consciously examine the geometry of the implied object to determine that it is impossible.
Impossible objects are of interest to psychologists, mathematicians and artists without falling entirely into any one discipline.
Read more about Impossible Object: Notable Examples, History
Famous quotes containing the words impossible and/or object:
“Genteel women suppose that those things do not really exist about which it is impossible to talk in polite company.”
—Friedrich Nietzsche (1844–1900)
“Pleasure cannot be shared; like Pain, it can only be experienced or inflicted, and when we give pleasure to our Lovers or bestow Charity upon the Needy, we do so, not to gratify the object of our Benevolence, but only ourselves. For the Truth is that we are kind for the same reason as we are cruel, in order that we may enhance the sense of our own Power.”
—Aldous Huxley (1894–1963)