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Uchiwa-e (団扇絵) are a genre of Japanese ukiyo-e woodblock print, which appear on rigid, paddle-shaped hand fans known as uchiwa (団扇).Ovoid images matching the outline of uchiwa were printed on rectangular sheets of washi rice paper, then cut along the margins and pasted onto a skeletal bamboo frame.
Geometric Origami is a book on the mathematics of paper folding, focusing on the ability to simulate and extend classical straightedge and compass constructions using origami. It was written by Austrian mathematician Robert Geretschläger [ de ] and published by Arbelos Publishing (Shipley, UK) in 2008.
This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: png -> svg. The original can be viewed here: Parts of a simple polygon.png: . Modifications made by A2569875.
Photo. One difference between photography and other forms of graphics is that a photographer, in principle, just records a single moment in reality, with seemingly no interpretation. However, a photographer can choose the field of view and angle, and may also use other techniques, such as various lenses to choose the view or filters to change ...
Handheld Brise fan from 1800. A handheld fan, or simply hand fan, is a broad, flat surface that is waved back-and-forth to create an airflow. Generally, purpose-made handheld fans are folding fans, which are shaped like a sector of a circle and made of a thin material (such as paper or feathers) mounted on slats which revolve around a pivot so that it can be closed when not in use.
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In geometry, a bigon, [1] digon, or a 2-gon, is a polygon with two sides and two vertices.Its construction is degenerate in a Euclidean plane because either the two sides would coincide or one or both would have to be curved; however, it can be easily visualised in elliptic space.