Visual system

The visual system is the part of the central nervous system which gives organisms the ability to process visual detail, as well as enabling the formation of several non-image photo response functions. It detects and interprets information from visible light to build a representation of the surrounding environment. The visual system carries out a number of complex tasks, including the reception of light and the formation of monocular representations; the buildup of a nuclear binocular perception from a pair of two dimensional projections; the identification and categorization of visual objects; assessing distances to and between objects; and guiding body movements in relation to the objects seen. The psychological process of visual information is known as visual perception, a lack of which is called blindness. Non-image forming visual functions, independent of visual perception, include the pupillary light reflex (PLR) and circadian photoentrainment.

Structure

This article mostly describes the visual system of mammals, humans in particular, although other "higher" animals have similar visual systems (see bird vision, vision in fish, mollusc eye, reptile vision). In the case of mammals (including humans), the visual system consists of:

Pink Floyd

Pink Floyd were an English rock band formed in London. They achieved international acclaim with their progressive and psychedelic music. Distinguished by their use of philosophical lyrics, sonic experimentation, extended compositions and elaborate live shows, they are one of the most commercially successful and musically influential groups in the history of popular music.

Pink Floyd were founded in 1965 by students Syd Barrett, Nick Mason, Roger Waters, and Richard Wright. They gained popularity performing in London's underground music scene during the late 1960s, and under Barrett's leadership released two charting singles and a successful debut album, The Piper at the Gates of Dawn (1967). David Gilmour joined as a fifth member in December 1967; Barrett left the band in April 1968 due to deteriorating mental health. Waters became the band's primary lyricist and, by the mid-1970s, their dominant songwriter, devising the concepts behind their critically and commercially successful albums The Dark Side of the Moon (1973), Wish You Were Here (1975), Animals (1977), The Wall (1979) and The Final Cut (1983). The Dark Side of the Moon and The Wall became two of the best-selling albums of all time.

Windows Live Messenger

Windows Live Messenger (formerly MSN Messenger) is a discontinued instant messaging client developed by Microsoft for Windows, Xbox 360, BlackBerry OS, iOS, Java ME, S60 on Symbian OS 9.x, and Zune HD. It connected to the Microsoft Messenger service while also having compatibility with Yahoo! Messenger and Facebook Messenger. The client was first released as MSN Messenger on July 22, 1999, and was marketed under the MSN branding until 2005 when it was rebranded under Windows Live and has since been officially known by its present name, although its previous name was still used colloquially by most of its users. In June 2009, Microsoft reported the service attracted over 330 million active users each month, placing Messenger among the most widely used instant messaging clients in the world.

Following the acquisition of Skype Technologies in May 2011, Microsoft added interoperability between Skype and Microsoft accounts, allowing Skype (which had features unique to its platform and a wider user base) to communicate with Messenger contacts. In 2013, Windows Live Messenger was discontinued and Microsoft began ceasing service to existing clients. The service in China remained active for another 18 months, and ceased operations on October 31, 2014.

Pretty Lights

Derek Vincent Smith (born November 25, 1981) is an American electronic music artist who performs under the stage name Pretty Lights, originally a duo project consisting of him and Michal Menert, who left after the release of their first album. Smith is also the proprietor of an associated music label, Pretty Lights Music.

Early life

Smith started skateboarding with Michal Menert in the 8th grade. The pair, together with a drummer Menert knew, began making music after Smith brought a bass guitar to a skating session. Paul Brandt (Paul Basic) eventually replaced their original drummer. Calling themselves "The Freeze", the band consisted of Derek Vincent Smith on the bass guitar, Michal Menert on the guitar and keyboard, and Paul Brandt on the drums. The group was influenced by artists like the Beastie Boys, Tha Alkaholiks, A Tribe Called Quest, Wu-Tang Clan, The Roots, and The Casualties as well as by old school hip hop, funk, punk rock, and the skater culture. The band placed second in a community battle of bands in their sophomore year. After graduating from high school, Smith attended University of Colorado at Boulder, but dropped out during his freshman year to focus on his music instead.