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The Nine Dots Puzzle is the first known puzzle game where the player has to connect dots. But in this variant the goal is not to draw a picture, but to solve a logic puzzle . The emergence of connect the dots games in the printed press takes place in the early 20th century.
Random dot autostereogram/hidden image stereogram; Is also known as single image random dot stereogram (SIRDS). This term also refers to autostereograms where the hidden 3D image is created using a random pattern of dots within one image, [29] shaped by a depth map within a dedicated stereogram rendering program. [32]
NSA photo of microdots taped inside the label of an envelope. The envelope was sent by German spies in Mexico City to Lisbon during World War II, but was intercepted by Allied intelligence. A microdot is text or an image substantially reduced in size to prevent detection by unintended recipients. Microdots are normally circular and around 1 ...
The first printed photo using a halftone in a Canadian periodical, October 30, 1869 A multicolor postcard (1899) printed from hand-made halftone plates. While there were earlier mechanical printing processes that could imitate the tone and subtle details of a photograph, most notably the Woodburytype, expense and practicality prohibited their being used in mass commercial printing that used ...
The EURion constellation is made up of five rings. The EURion constellation (also known as Omron rings [1] or doughnuts [2]) is a pattern of symbols incorporated into a number of secure documents such as banknotes, cheques, and ownership title certificates designs worldwide since about 1996.
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Nowadays the most common sources of single photons [citation needed] are single molecules, Rydberg atoms, [37] [dubious – discuss] diamond colour centres and quantum dots, with the last being widely studied [citation needed]} with efforts from many research groups to realize quantum dots that fluoresce single photons at room temperature with ...