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Chromostereopsis. Blue–red contrast demonstrating depth perception effects. 3 Layers of depths "Rivers, Valleys & Mountains". 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 ...
Barber shop in Torquay, Devon, England, with red and white pole. A barber's pole is a type of sign used by barbers to signify the place or shop where they perform their craft. The trade sign is, by a tradition dating back to the Middle Ages, a staff or pole with a helix of colored stripes (often red and white in many countries, but usually red ...
A ner tamid hanging over the ark in a synagogue. In Judaism, the sanctuary lamp is known as a Ner Tamid (Hebrew, “eternal flame” or “eternal light”), Hanging or standing in front of the ark in every Jewish synagogue, it is meant to represent the menorah of the Temple in Jerusalem, as well as the perpetual fire kept on the altar of burnt offerings before the Temple. [2]
Ophthalmogram showing blood vessels in front of the retina. Their shadow is the cause of the blue field entoptic phenomenon. The dots are white blood cells moving in the capillaries in front of the retina of the eye. [5] Blue light (optimal wavelength: 430 nm) is absorbed by the red blood cells that fill the capillaries.
t. e. The handkerchief code (also known as the hanky code, the bandana code, and flagging) [ 1] is a system of color-coded cloth handkerchief or bandanas for non-verbally communicating one's interests in sexual activities and fetishes. The color of the handkerchief identifies a particular activity, and the pocket it is worn in (left or right ...
Ambulances usually have large integrated roof corner flash lights, 3 blue ones and 1 red at front right position, and 3-5 or more smaller red/blue flash lights on mirrors, hood, grill, side and back, mounted and used in a zig-zag pattern. Separately-mounted external lightbars on ambulances are rare, used just on doctor's cars and older vans.
In New Zealand, where they drive on the left, when a road is given a green light from an all direction stop, a red arrow can continue to display to turning traffic, holding traffic back while the pedestrian crossing on the side road is given a green signal (for left turns) or while oncoming traffic goes straight ahead and there is no permissive right turn allowed (for right turns).
According to NPR, in the Victorian era, Christmas had a much wider and varied palette, which featured combinations of red and green, red and blue, blue and green, or blue and white—and that ...