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  2. 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 ...

  3. X-ray vision - Wikipedia

    en.wikipedia.org/wiki/X-ray_vision

    There also exist certain night-vision equipped cameras that can be modified to see through clothing at a frequency just below visible light. Such imaging is not true x-ray vision, but rather shows variations in heat radiation rising from the skin beneath the clothing which can provide some detail of the body beneath.

  4. Transparency and translucency - Wikipedia

    en.wikipedia.org/wiki/Transparency_and_translucency

    A transparency of 50 percent is enough to make an animal invisible to a predator such as cod at a depth of 650 metres (2,130 ft); better transparency is required for invisibility in shallower water, where the light is brighter and predators can see better. For example, a cod can see prey that are 98 percent transparent in optimal lighting in ...

  5. Invisibility - Wikipedia

    en.wikipedia.org/wiki/Invisibility

    Technology can be used theoretically or practically to render real-world objects invisible. Making use of a real-time image displayed on a wearable display, it is possible to create a see-through effect. This is known as active camouflage.

  6. Autostereogram - Wikipedia

    en.wikipedia.org/wiki/Autostereogram

    Autostereogram of a cube rotating. You will need to learn how to see an autostereogram to see this. Autostereogram. follow the instructions to see the effect. An autostereogram is a two-dimensional (2D) image that can create the optical illusion of a three-dimensional (3D) scene.

  7. Naked eye - Wikipedia

    en.wikipedia.org/wiki/Naked_eye

    Naked eye, also called bare eye or unaided eye, is the practice of engaging in visual perception unaided by a magnifying, light-collecting optical instrument, such as a telescope or microscope, or eye protection.

  8. 77 Times Things Seamlessly Merged Into Surroundings ... - AOL

    www.aol.com/lifestyle/77-times-things-seamlessly...

    Scroll down to start and make sure to upvote the ones that gave you a really hard time so others can be challenged too! #1 Invisible Good Boy Image credits: someonenoo

  9. Visual perception - Wikipedia

    en.wikipedia.org/wiki/Visual_perception

    Leonardo da Vinci: The eye has a central line and everything that reaches the eye through this central line can be seen distinctly. Alhazen (965 – c. 1040) carried out many investigations and experiments on visual perception, extended the work of Ptolemy on binocular vision, and commented on the anatomical works of Galen.