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  2. Magic lantern - Wikipedia

    en.wikipedia.org/wiki/Magic_lantern

    Because a single lens inverts an image projected through it (as in the phenomenon which inverts the image of a camera obscura), slides were inserted upside down in the magic lantern, rendering the projected image correctly oriented. [1] It was mostly developed in the 17th century and commonly used for entertainment purposes.

  3. Projector - Wikipedia

    en.wikipedia.org/wiki/Projector

    Most projectors create an image by shining a light through a small transparent lens, but some newer types of projectors can project the image directly, by using lasers. A virtual retinal display , or retinal projector, is a projector that projects an image directly on the retina instead of using an external projection screen.

  4. Schroeder stairs - Wikipedia

    en.wikipedia.org/wiki/Schroeder_stairs

    Schroeder stairs can be perceived in two ways, depending on whether the viewer considers A or B to be the closer wall. Schroeder stairs (Schröder's stairs) is an optical illusion which is a two-dimensional drawing which may be perceived either as a drawing of a staircase leading from left to right downwards or the same staircase only turned upside down, a classical example of perspective ...

  5. Camera obscura - Wikipedia

    en.wikipedia.org/wiki/Camera_obscura

    A camera obscura (pl. camerae obscurae or camera obscuras; from Latin camera obscūra 'dark chamber') [1] is the natural phenomenon in which the rays of light passing through a small hole into a dark space form an image where they strike a surface, resulting in an inverted (upside down) and reversed (left to right) projection of the view outside.

  6. Traffic light installed upside-down in NYC — and it’s stayed ...

    www.aol.com/news/traffic-light-installed-upside...

    The city installed an upside-down traffic light outside a Tribeca bar -- and it's been blinking away for months, The Post has learned. Traffic light installed upside-down in NYC — and it’s ...

  7. Gobo (lighting) - Wikipedia

    en.wikipedia.org/wiki/Gobo_(lighting)

    The use of the gobo is "subtractive", as opposed to using a "reflector" to bounce added light into a shadow (thus "additive" lighting). Use of a gobo subtracts light from a portion of an overall shaded subject and creates a contrast between one side of the subject and the other. [17]

  8. Lava lamp - Wikipedia

    en.wikipedia.org/wiki/Lava_lamp

    The vessel is placed on a base containing an incandescent light bulb whose heat causes temporary reductions in the wax's density and the liquid's surface tension. As the warmed wax rises through the liquid, it cools, loses its buoyancy, and falls back to the bottom of the vessel in a cycle that is visually suggestive of pāhoehoe lava , hence ...

  9. Fata Morgana (mirage) - Wikipedia

    en.wikipedia.org/wiki/Fata_Morgana_(mirage)

    A Fata Morgana may be seen on land or at sea, in polar regions, or in deserts. It may involve almost any kind of distant object, including boats, islands, and the coastline. Often, a Fata Morgana changes rapidly. The mirage comprises several inverted (upside down) and upright images stacked on top of one another.

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