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Long exposure photography entails using a long-duration shutter speed to sharply capture the stationary elements of images while blurring, smearing, or obscuring its moving elements. Technique When a scene includes both stationary and moving subjects (for example, a fixed street and moving cars or a camera within a car showing a fixed dash-board and moving scenery), a slow shutter speed can cause interesting effects, such as light trails...

Reflection is the change in direction of a wavefront at an interface between two different media so that the wavefront returns into the medium from which it originated. Common examples include the reflection of light, sound and water waves. The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected. Mirrors exhibit specular reflection. In acoustics, reflection causes echoes and is used in sonar...

Street art is any art developed in public spaces — that is, "in the streets" — though the term usually refers to unsanctioned art, as opposed to government sponsored initiatives. The term can include traditional graffiti artwork, sculpture, stencil graffiti, sticker art, wheatpasting and street poster art, video projection, art intervention, guerrilla art, flash mobbing and street installations...

Best known f­or his exploration photography, George Steinmetz sets out to di­scover the­ ­few remaining secrets in our world today: remote deserts, obscure cultures, the ­mysteries of science and technology. A regular contributor to National Geographic and GEO Magazines, he has explored subjects ranging from the remotest str­etches of Arabia's Empty Quarter to the­ unknown tree people of Irian Jaya...