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A wallpaper group (or plane symmetry group or plane crystallographic group) is a mathematical classification of a two-dimensional repetitive pattern, based on the symmetries in the pattern. Such patterns occur frequently in architecture and decorative art, especially in textiles, tiles, and wallpaper . The simplest wallpaper group, Group p 1 ...
From today's featured article. Hudson Volcano is a volcano in the rugged mountains of southern Chile. Lying in the Southern Volcanic Zone of the Andes, it was formed by the subduction of the oceanic Nazca Plate under the continental South American Plate. Hudson has the form of a 10-kilometre-wide (6-mile) volcanic caldera filled with ice.
Everystockphoto.com – Searching over 4.3 million public domain and creative commons photos including Wikipedia and NASA. Free user accounts with drag and drop collections, and other features. Google Image Search – Advanced search can search for free licensed or PD works. By default, Google does not filter based on license.
Pixabay.com is a free stock photography and royalty-free stock media website. It is used for sharing photos, illustrations, vector graphics, film footage, stock music and sound effects, exclusively under the custom Pixabay license, which generally allows the free use of the material with some restrictions. [ 1][ 2][ 3] You can use the site's ...
Free images should not be watermarked, distorted, have any credits or titles in the image itself or anything else that would hamper their free use, unless, of course, the image is intended to demonstrate watermarking, distortion, titles, etc. and is used in the related article. Exceptions may be made for historic images when the credit or title ...
The top and bottom images produce a dent or projection depending on whether viewed with cross- () or wall- () eyed vergence. An autostereogram is a two-dimensional (2D) image that can create the optical illusion of a three-dimensional (3D) scene. Autostereograms use only one image to accomplish the effect while normal stereograms require two.
Kali, a free and open source software application for wallpaper, frieze and other patterns. Kali Archived 2020-11-21 at the Wayback Machine, free downloadable Kali for Windows and Mac Classic. Tess, a nagware tessellation program for multiple platforms, supports all wallpaper, frieze, and rosette groups, as well as Heesch tilings.
Click edit on any accessible page; Surround the page title you want to create in doubled brackets, e.g., [[Proposed Title]]; Click the Show previewbutton (notthe Publish changes button); Click on the red link revealed. Method 3: saving a red link. Often you will want to have easy continuing access to a page you create.