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Lexiko was a word game invented by Alfred Mosher Butts. [1] It was a precursor of Scrabble.The name comes from the Greek lexicos, meaning "of or for words". [2]Lexiko was played with a set of 100 square cardboard tiles, with the same letter distribution later used by Scrabble (see Scrabble letter distributions), but no board.
This two-way writing system reveals that modern ambigrams can have quite ancient origins, with an intuitive component in some minds. Mirror writing in Islamic calligraphy flourished during the early modern period, but its origins may stretch as far back as pre-Islamic mirror-image rock inscriptions in the Hejaz .
Words in Colour first appeared in 1962, published simultaneously in the UK and US. Later versions were published in French (French: Lecture en Couleurs) and Spanish (Spanish: Letras en Color). [2] Words in Colour is a synthetic phonics system that uses colour to indicate the phonetic properties of letters. [3]
An illusion closely related to the checker shadow illusion, which also relies on using implied visual shadows to seemingly darken a brighter region to the same color as a well-lit dark region, involves two squares placed at an angle, with the darker square being lit and the lighter square at an angle which receives poor light. [2]
Chromostereopsis is a visual illusion whereby the impression of depth is conveyed in two-dimensional color images, usually of red–blue or red–green colors, but can also be perceived with red–grey or blue–grey images. [1] [2] Such illusions have been reported for over a century and have generally been attributed to some form of chromatic ...
Rare example of an ambiguous image that can be interpreted in more than two ways: as the letters "KB", the mathematical inequality "1 < 13" or the letters "VD" with their mirror image. [7] When we see an image, the first thing we do is attempt to organize all the parts of the scene into different groups. [8]
This is an accepted version of this page This is the latest accepted revision, reviewed on 3 February 2025. Colors are an important part of visual arts, fashion, interior design, and many other fields and disciplines. The following is a list of colors. A number of the color swatches below are taken from domain-specific naming schemes such as X11 or HTML4. RGB values are given for each swatch ...
A fictitious color or imaginary color is a point in a color space that corresponds to combinations of cone cell responses in one eye that cannot be produced by the eye in normal circumstances seeing any possible light spectrum. [4] No physical object can have an imaginary color.