Analysis of Locally Coincident Contrary Motion

thumb_8019_353.384The phrase “locally coincident contrary motion” refers to the tendency for graphic entities to move in two different directions at the same time and in the same area. An example of this phenomenon might be a reaction that appears to spiral to the left while contracting, yet is paradoxically also exhibiting characteristics of turning to the right and expanding. This effect is caused by the delay which occurs during one entire traversal of signal from camera to data cable to projector and back to the camera, called the “reaction cycle time.” The accumulated delays between components can take so long that two separate reactions can be interleaved, giving the impression of motion in two directions.

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