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Blue - online puzzles

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eggs puzzle online from photo
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Vietnamese pig online puzzle
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Sweets online puzzle
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Workshop equipment online puzzle
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Colorful crystals puzzle online from photo
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Oriental Pearl TV Tower in Shanghai (China) online puzzle
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Jigsaw Puzzle online puzzle
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Collage-clocks puzzle online from photo
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Porcelain puzzle online from photo
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Coast of Amalfi (Italy) puzzle online from photo
96Coast of Amalfi (Italy)solved 1,518 times
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Donuts with colorful icing online puzzle
150Donuts with colorful icingsolved 1,517 times
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Hawaii (USA) online puzzle
176Hawaii (USA)solved 1,510 times
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Prom Dresses 1 online puzzle
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Bucker Bu 131 Jungmann online puzzle
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Tropical beach online puzzle
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Hard hat online puzzle
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280Colorful house in Little India (Singapore)solved 1,500 times
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Oquirrh Mountain Temple online puzzle
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Mexican cuisine puzzle online from photo
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Panorama of Perth at dusk (Australia) online puzzle
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Suburban train in Moscow (Russia) puzzle online from photo
70Suburban train in Moscow (Russia)solved 1,492 times
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Fortress of Guaita (San Marino) online puzzle
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Hearts puzzle online from photo
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West Mitten in Monument Valley (USA) online puzzle
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Furniture handles online puzzle
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Evening panorama of Milwaukee (USA) puzzle online from photo
54Evening panorama of Milwaukee (USA)solved 1,471 times
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buttons online puzzle
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Vases puzzle online from photo
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ceramic plate from Deruta, Italy puzzle online from photo
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Online puzzle Blue

Blue

Blue is one of the three primary colours in the RYB colour model (traditional colour theory), as well as in the RGB (additive) colour model. It lies between violet and cyan on the spectrum of visible light. The eye perceives blue when observing light with a dominant wavelength between approximately 450 and 495 nanometres. Most blues contain a slight mixture of other colours; azure contains some green, while ultramarine contains some violet. The clear daytime sky and the deep sea appear blue because of an optical effect known as Rayleigh scattering. An optical effect called the Tyndall effect explains blue eyes. Distant objects appear more blue because of another optical effect called aerial perspective.

Blue has been an important colour in art and decoration since ancient times. The semi-precious stone lapis lazuli was used in ancient Egypt for jewellery and ornament and later, in the Renaissance, to make the pigment ultramarine, the most expensive of all pigments. In the eighth century Chinese artists used cobalt blue to colour fine blue and white porcelain. In the Middle Ages, European artists used it in the windows of cathedrals. Europeans wore clothing coloured with the vegetable dye woad until it was replaced by the finer indigo from America. In the 19th century, synthetic blue dyes and pigments gradually replaced organic dyes and mineral pigments. Dark blue became a common colour for military uniforms and later, in the late 20th century, for business suits. Because blue has commonly been associated with harmony, it was chosen as the colour of the flags of the United Nations and the European Union.In the United States and Europe, blue is the colour that both men and women are most likely to choose as their favourite, with at least one recent survey showing the same across several other countries, including China, Malaysia, and Indonesia. Past surveys in the US and Europe have found that blue is the colour most commonly associated with harmony, confidence, masculinity, knowledge, intelligence, calm, distance, infinity, the imagination, cold, and sadness.