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  2. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    Afterimage on empty shape (also known as color dove illusion) This type of illusion is designed to exploit graphical similarities. 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 ...

  3. Asterism (gemology) - Wikipedia

    en.wikipedia.org/wiki/Asterism_(gemology)

    The stars are caused by the light reflecting from needle-like inclusions of rutile aligned perpendicularly to the rays of the star. The star-effect may be also caused by the inclusions of hematite . In black star sapphire hematite needles formed parallel to the faces of the second order prism produce asterism.

  4. Mirage of astronomical objects - Wikipedia

    en.wikipedia.org/wiki/Mirage_of_astronomical_objects

    Pancake-like shape of the setting Sun in a mock mirage. A mock mirage of astronomical objects is much more complex than an inferior mirage. While an inferior mirage of astronomical objects can produce only two images, a mock mirage can produce multiple miraged images. The shapes of the miraged object are changing constantly and unpredictably.

  5. Epicanthic fold - Wikipedia

    en.wikipedia.org/wiki/Epicanthic_fold

    An epicanthic fold or epicanthus [6] is a skin fold of the upper eyelid that covers the inner corner (medial canthus) of the eye. [3] However, variation occurs in the nature of this feature and the presence of "partial epicanthic folds" or "slight epicanthic folds" is noted in the relevant literature.

  6. Pleiades - Wikipedia

    en.wikipedia.org/wiki/Pleiades

    The brightest stars form a shape somewhat similar to that of Ursa Major and Ursa Minor. The total mass contained in the cluster is estimated to be approximately 800 solar masses and is dominated by fainter and redder stars [clarification needed]. [68] An estimate of the frequency of binary stars in the Pleiades is approximately 57%. [69]

  7. Astronomical symbols - Wikipedia

    en.wikipedia.org/wiki/Astronomical_symbols

    [47] [55] In modern renditions, the spearhead has a broader or narrower diamond shape. In 1802, it was given a cordate leaf shape. A variation has a triangular head, conflating it with the alchemical symbol for sulfur. [47] 3 Juno [48] [85] U+26B5 (dec 9909) ⚵ a scepter topped with a star [48] [42] [86] 4 Vesta [49] U+1F777 (dec 128887) 🝷

  8. Optical illusion - Wikipedia

    en.wikipedia.org/wiki/Optical_illusion

    The brain makes sense of shapes and symbols putting them together like a jigsaw puzzle, formulating that which is not there to that which is believable. [citation needed] The gestalt principles of perception govern the way different objects are grouped. Good form is where the perceptual system tries to fill in the blanks in order to see simple ...

  9. List of planetary nebulae - Wikipedia

    en.wikipedia.org/wiki/List_of_planetary_nebulae

    Download as PDF; Printable version; In other projects Wikimedia Commons; Wikidata item; Appearance. move to sidebar hide ... Eye of Sauron Nebula M 1-42: 10 14 ...