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In a figure / ground ambigram, letters fit together so the negative space around and between one word spells another word. [42] In Gestalt psychology, figure–ground perception is known as identifying a figure from the background. For example, black words on a printed paper are seen as the "figure", and the white sheet as the "background".
composite image: an interactive mapawith orange dots on a green background showing reports of drone sightings and inset three white dots of light in a dark sky
A type of multistable illusion where an image of a concave object, rotated so that the light source is below, may sometimes appear convex, and vice versa. This phenomenon is because light sources tend to shine from above the subject. Delboeuf illusion: An optical illusion of relative size perception.
Eigengrau (German for "intrinsic gray"; pronounced [ˈʔaɪ̯gŋ̍ˌgʁaʊ̯] ⓘ), also called Eigenlicht (Dutch and German for "intrinsic light"), dark light, or brain gray, is the uniform dark gray background color that many people report seeing in the absence of light.
These are impossibly highly saturated. For example, to see "hyperbolic orange": staring at bright cyan causes an orange afterimage, then on looking at orange, the resulting orange afterimage seen against the orange background may cause an orange color purer than the purest orange color that can be made by any normally seen light.
The image of the sun at the time of the eclipse, unless it is total, demonstrates that when its light passes through a narrow, round hole and is cast on a plane opposite to the hole it takes on the form of a moon-sickle. The image of the sun shows this peculiarity only when the hole is very small.
Enigma may refer to: Riddle, someone or something that is mysterious or puzzling; Biology. ENIGMA, a class of gene in the LIM domain; Computing and technology
Nowadays, the ligatures have been generally replaced by the digraphs ae and oe (encyclopaedia, diarrhoea) in British English or just e (encyclopedia, diarrhea) in American English, though both spell some words with only e (economy, ecology) and others with ae and oe (paean, amoeba, oedipal, Caesar).