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  2. Shepard elephant - Wikipedia

    en.wikipedia.org/wiki/Shepard_elephant

    Blivet illusion, another impossible figure based on figure-ground confusion. The image is widely reproduced and discussed. Brad Honeycutt, author of Exceptional Eye Tricks, calls the Shepard elephant "one of the most famous and classic optical illusions."

  3. Troxler's fading - Wikipedia

    en.wikipedia.org/wiki/Troxler's_fading

    Troxler's fading, also called Troxler fading or the Troxler effect, is an optical illusion affecting visual perception. When one fixates on a particular point for even a short period of time, an unchanging stimulus away from the fixation point will fade away and disappear. Research suggests that at least some portion of the perceptual phenomena ...

  4. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    The Hollow-Face illusion is an optical illusion in which the perception of a concave mask of a face appears as a normal convex face. Hybrid image. A Hybrid image is an optical illusion developed at MIT in which an image can be interpreted in one of two different ways depending on viewing distance. Illusory contours.

  5. Hollow-Face illusion - Wikipedia

    en.wikipedia.org/wiki/Hollow-Face_illusion

    The Hollow-Face illusion (also known as Hollow-Mask illusion) is an optical illusion in which the perception of a concave mask of a face appears as a normal convex face. While a convex face will appear to look in a single direction, and the gaze of a flat face, such as the Lord Kitchener Wants You poster, can appear to track a moving viewer, a ...

  6. Flashed face distortion effect - Wikipedia

    en.wikipedia.org/wiki/Flashed_Face_Distortion_Effect

    Flashed face distortion effect. The flashed face distortion effect is a visual illusion involving the fast-paced presentation of eye-aligned faces. [1] Faces appear grotesquely transformed while the viewer focuses on the cross midway between them. [2][3] As with many scientific discoveries, the phenomenon was first observed by chance.

  7. Penrose triangle - Wikipedia

    en.wikipedia.org/wiki/Penrose_triangle

    The Penrose triangle, also known as the Penrose tribar, the impossible tribar, [1] or the impossible triangle, [2] is a triangular impossible object, an optical illusion consisting of an object which can be depicted in a perspective drawing. It cannot exist as a solid object in ordinary three-dimensional Euclidean space, although its surface ...

  8. Ames room - Wikipedia

    en.wikipedia.org/wiki/Ames_room

    The illusion of an ordinary room is because most information about the true shape of the room does not reach the observer's eye. The geometry of the room is carefully designed, using perspective, so that, from the peephole, the image projected onto the retina of the observer's eye is the same as that of an ordinary room. Once the observer is ...

  9. Necker cube - Wikipedia

    en.wikipedia.org/wiki/Necker_cube

    The Necker cube is an optical illusion that was first published as a rhomboid in 1832 by Swiss crystallographer Louis Albert Necker. [1] It is a simple wire-frame, two dimensional drawing of a cube with no visual cues as to its orientation, so it can be interpreted to have either the lower-left or the upper-right square as its front side.