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  2. Lunar swirls - Wikipedia

    en.wikipedia.org/wiki/Lunar_swirls

    Lunar Reconnaissance Orbiter Wide Angle Camera image of Reiner Gamma Another view of Reiner Gamma swirls Mare Ingenii Swirls east of Firsov crater, from Apollo 10. Lunar swirls are enigmatic features found across the Moon's surface, which are characterized by having a high albedo, appearing optically immature (i.e. having the optical characteristics of a relatively young regolith), and (often ...

  3. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    Ambiguous image: These are images that can form two separate pictures. For example, the image shown forms a rabbit and a duck. Ambigram: A calligraphic design that has multiple or symmetric interpretations. Ames room illusion An Ames room is a distorted room that is used to create a visual illusion. Ames trapezoid window illusion

  4. Throbber - Wikipedia

    en.wikipedia.org/wiki/Throbber

    A throbber animation like that seen on many websites when a blocking action is being performed in the background. A throbber, also known as a loading icon, is an animated graphical control element used to show that a computer program is performing an action in the background (such as downloading content, conducting intensive calculations or communicating with an external device).

  5. Fraser spiral illusion - Wikipedia

    en.wikipedia.org/wiki/Fraser_spiral_illusion

    The visual distortion is produced by combining a regular line pattern (the circles) with misaligned parts (the differently colored strands). [2] Zöllner's illusion and the café wall illusion are based on a similar principle, like many other visual effects, in which a sequence of tilted elements causes the eye to perceive phantom twists and ...

  6. Wallpaper (computing) - Wikipedia

    en.wikipedia.org/wiki/Wallpaper_(computing)

    A computer screen showing a background wallpaper photo of the Palace of Versailles A wallpaper from fractal. A wallpaper or background (also known as a desktop background, desktop picture or desktop image on computers) is a digital image (photo, drawing etc.) used as a decorative background of a graphical user interface on the screen of a computer, smartphone or other electronic device.

  7. GIF - Wikipedia

    en.wikipedia.org/wiki/GIF

    The GIF Specification allows each image within the logical screen of a GIF file to specify that it is interlaced; i.e., that the order of the raster lines in its data block is not sequential. This allows a partial display of the image that can be recognized before the full image is painted.

  8. Spinning dancer - Wikipedia

    en.wikipedia.org/wiki/Spinning_Dancer

    The illusion derives from the lack of visual cues for depth. For instance, as the dancer's arms move from viewer's left to right, it is possible to view her arms passing between her body and the viewer (that is, in the foreground of the picture, in which case she would be circling counterclockwise on her right foot) and it is also possible to view her arms as passing behind the dancer's body ...

  9. Halo (optical phenomenon) - Wikipedia

    en.wikipedia.org/wiki/Halo_(optical_phenomenon)

    Artificial Halo projected on a spherical screen. [24] [25] Visible are: Tangential arcs, Parry arcs, (sub)parhelia, parhelic circle, heliac arcs. Artificial ice crystals have been employed to create halos which are otherwise unattainable in the mechanical approach via the use of glass crystals, e.g. circumzenithal and circumhorizontal arcs. [26]