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Freckles are clusters of concentrated melanin which are most often visible on people with a fair complexion. A freckle is also called an "ephelis". Freckles do not have an increased number of melanin producing cells (melanocytes). This is in contrast to Lentigines and Moles. Biology Freckles can be found on anyone no matter their genetic background; however, having freckles is genetic and is related to the presence of the dominant melanocortin-1 receptor MC1R gene variant...

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...