Continuous light means that when you turn the studio lights on, they stay on like a video light or a flashlight. An obvious advantage to working with continuous light is that unlike strokes and monolights, which takes a great deal of practice to learn before you inherently understand what changes will look like in a shot, what you're saying in the real world with continuous lights will closely resemble the image that you're capturing.
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Op art designs are usually geometric patterns used to create an illusion. Im not really sure what you mean by "how say two artists that drow these things"
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The camera obscura later became a popular tool during the Middle Ages and the Renaissance, particularly after inventors began using biconvex lenses to brighten its images. Astronomers used it to protect their eyes while observing the sun and solar eclipses, and artists employed it as an aid in portraiture and landscape painting.
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