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  2. Category : Images that should have transparent backgrounds

    en.wikipedia.org/wiki/Category:Images_that...

    Media in category "Images that should have transparent backgrounds" The following 105 files are in this category, out of 105 total. 111th Battle For The Bell.jpeg 370 × 208; 33 KB

  3. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    Movement that appears to occur when fixed pictures turn on and off. Bezold Effect: An apparent change of tone of a colour due to the alteration of the colour of the background. Blivet: Also known as "poiuyt" or "devil's fork", this illusion is an impossible image because in reality the shape cannot exist. Café wall illusion

  4. Schlieren imaging - Wikipedia

    en.wikipedia.org/wiki/Schlieren_imaging

    Schlieren imaging is a method to visualize density variations in transparent media. [1]Schlieren imaging of a focusing ultrasonic transducer Schlieren image sequence of a bullet traveling in free-flight, demonstrating the air pressure dynamics surrounding the bullet

  5. Schlieren - Wikipedia

    en.wikipedia.org/wiki/Schlieren

    This image is located at the conjugate distance to the lens according to the thin lens equation: = + where is the focal length of the lens, is the distance from the object to the lens and is the distance from the image of the object to the lens. A knife edge at the point source-image location is positioned as to partially block some light from ...

  6. Schlieren photography - Wikipedia

    en.wikipedia.org/wiki/Schlieren_photography

    Background-oriented schlieren technique (BOS [7]) relies on measuring or visualizing shifts in focused images. In these techniques, the background and the schlieren object (the distortion to be visualized) are both in focus and the distortion is detected because it moves part of the background image relative to its original position.

  7. Pareidolia - Wikipedia

    en.wikipedia.org/wiki/Pareidolia

    Satellite photograph of a mesa in the Cydonia region of Mars, often called the "Face on Mars" and cited as evidence of extraterrestrial habitation. Pareidolia (/ ˌ p ær ɪ ˈ d oʊ l i ə, ˌ p ɛər-/; [1] also US: / ˌ p ɛər aɪ-/) [2] is the tendency for perception to impose a meaningful interpretation on a nebulous stimulus, usually visual, so that one detects an object, pattern, or ...

  8. These are the pedophile symbols you need to know to protect ...

    www.aol.com/news/2016-04-26-these-are-the...

    In March, a mother was horrified to find a pedophile symbol on a toy she bought for her daughter. Although the symbol was not intentionally placed on the toy by the company who manufactured the ...

  9. 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 ...

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