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[[Category:Musical instrument templates]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:Musical instrument templates]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.
[[Category:Musical instrument user templates]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:Musical instrument user templates]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.
Template documentation This template's initial visibility currently defaults to autocollapse , meaning that if there is another collapsible item on the page (a navbox, sidebar , or table with the collapsible attribute ), it is hidden apart from its title bar; if not, it is fully visible.
The Hering illusion (1861): When two straight and parallel lines are presented in front of radial background (like the spokes of a bicycle), the lines appear as if they were bowed outwards. Hollow-Face illusion: The Hollow-Face illusion is an optical illusion in which the perception of a concave mask of a face appears as a normal convex face.
In theatrical productions, an instrument schedule is a listing of all the lighting instruments and information about them used in a show. [1]: 223 The instruments are organized by their position on-stage, and is the distinguishing characteristic between an instrument schedule and a channel hookup or similar paperwork. The instrument schedule ...
The field angle of an instrument is the angle of the beam of light where it reaches 10% of the intensity of the center of the beam. Most manufacturers now use field angle to indicate the spread that the fixture has. However, older fixtures are described by the width of the lens x focal length of the instrument. For example, a 6x9 ellipsoidal ...
The globe effect, also known as rolling ball effect, is an optical illusion which can occur with optical instruments used visually, in particular binoculars or telescopes. If such an instrument is rectilinear, or free of rectilinear distortion, some observers get the impression of an image rolling on a convex surface when the instrument is panned.
Though the two circled dark discs are the same size, the left disc seems smaller than the right one. The Delboeuf illusion is an optical illusion of relative size perception: In the best-known version of the illusion, two discs of identical size have been placed near to each other and one is surrounded by a ring; the surrounded disc then appears larger than the non-surrounded disc if the ring ...