gradation of colours

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• enamelwork — e·nam·el·work (ĭ nămʹəl wûrk ) n. 1. Decorative work done in enamel. 2. Enamelware. * * * Metal objects decorated with an opaque glaze fused to the surface by intense heat. The resulting surface is hard and durable and can be brilliantly… …   Universalium

• Andrea Del Verrocchio —     Andrea del Verrocchio     † Catholic Encyclopedia ► Andrea del Verrocchio     Born at Florence, 1435; d. at Venice, 1488. He was called Andrea di Michele di Francesco de Cioni, but for his true name he substituted that of his master, the… …   Catholic encyclopedia

• photography, technology of — Introduction       equipment, techniques, and processes used in the production of photographs.  The most widely used photographic process is the black and white negative–positive system (Figure 1 >). In the camera the lens projects an image of… …   Universalium

• Restoration of the Sistine Chapel frescoes — The restoration of the frescoes of the Sistine Chapel was one of the most significant art restorations of the 20th century. The Sistine Chapel was built by Pope Sixtus IV within the Vatican immediately to the north of St. Peter s Basilica and… …   Wikipedia

• Rainbow — For other uses, see Rainbow (disambiguation). Double rainbow and supernumerary rainbows on the inside of the primary arc. The shadow of the photographer s head on the bottom marks the centre of the rainbow circle (antisolar point). A rainbow is… …   Wikipedia

• Animal colouration — has been a topic of interest and research in biology for well over a century. Colours may be cryptic (functioning as an adaptation allowing the prevention of prey detection; aposematic (functioning as a warning of unprofitability) or may be the… …   Wikipedia

• The Missing Shade of Blue — is an example introduced by the Scottish philosopher David Hume to show that it is at least conceivable that the mind can generate an idea without first being exposed to the relevant sensory experience. It is regarded as a problem by philosophers …   Wikipedia

• race — race1 /rays/, n., v., raced, racing. n. 1. a contest of speed, as in running, riding, driving, or sailing. 2. races, a series of races, usually of horses or dogs, run at a set time over a regular course: They spent a day at the races. 3. any… …   Universalium

• Race — /rays/, n. Cape, a cape at the SE extremity of Newfoundland. * * * I Term once commonly used in physical anthropology to denote a division of humankind possessing traits that are transmissible by descent and sufficient to characterize it as a… …   Universalium

• lepidopteran — /lep i dop teuhr euhn/, adj. 1. lepidopterous. n. 2. a lepidopterous insect. [1850 55; LEPIDOPTER(A) + AN] * * * Any of the more than 100,000 species constituting the order Lepidoptera (Greek: scaly wing ): butterflies, moths, and skippers. The… …   Universalium

• Film speed — is the measure of a photographic film s sensitivity to light, determined by sensitometry and measured on various numerical scales, the most recent being the ISO system. A closely related ISO system is used to measure the sensitivity of digital… …   Wikipedia