Stop motion (also known as stop-action or frame-by-frame) is an animation technique to make a physically manipulated object appear to move on its own. The object is moved in small increments between individually photographed frames, creating the illusion of movement when the series of frames is played as a continuous sequence. Clay figures are often used in stop motion for their ease of repositioning. Stop motion animation using clay is described as clay animation.

http://en.wikipedia.org/wiki/Stop_motion

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