Blue - online puzzles

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.

chicory flower puzzle online from photobaubles online puzzleBoat on the Beach in El-Nido (Philippines) online puzzleImages online puzzleSan Andrés and Providencia (Colombia) online puzzlePalm branches shelter online puzzleBay in the town of Bogliasco (Italy) online puzzleKul Sharif Mosque (Russia) puzzle online from photoPort on the island of Procida (Italy) puzzle online from photoMuffins online puzzleLondon Clocks 2 online puzzleCathedral in Florence (Italy) puzzle online from photoMoored boats online puzzlecosmos puzzle online from photoPalace of the Prince of Monaco puzzle online from photoSandy beach (Maldives) online puzzleColumbia River Gorge (USA) puzzle online from photoCamellia flower online puzzleHa Long Bay (Vietnam) puzzle online from photoDolphin online puzzleWhite-red tulips puzzle online from photoMexican blankets puzzle online from photoRegion of Big Sur in California (USA) online puzzlePitts S-2B online puzzle
Seagulls in flight puzzle online from photoMaine Coon cat online puzzleBeach on Roatan (Honduras) online puzzleClock tower in Graz (Austria) puzzle online from photoColorful buildings in Burano (Italy) puzzle online from photoColorfully decorated cupcakes puzzle online from photoCupecoy Beach on the island of Saint Martin (Saint Martin) puzzle online from photoColorful town of Vernazza (Italy) online puzzlePirogue on the beach (Madagascar) online puzzleWater taxis on Poros (Greece) puzzle online from photoGerbers puzzle online from photoToyota Hybrid X Concept online puzzleCarpets II puzzle online from photoCanal in Otaru (Japan) puzzle online from photoTown of Vernazza in Cinque Terre region (Italy) puzzle online from photoOld town in Tallin (Estonia) puzzle online from photoBags online puzzleVancouver (Canada) online puzzleGlass counter in the confectionery online puzzleBird’s eye view of Quito (Ecuador) puzzle online from photoLake Tahoe online puzzleChristmas tree balls online puzzleCaribbean beach puzzle online from photoHappy Wednesday! puzzle online from photo