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Cel animation is the traditional, hand-drawn animation technique that involves drawing and painting objects on celluloid (cel), a transparent sheet. Nearly all the cartoons in the pre-1990 era were created using cel animation
Negative space defines and emphasises the main subject of a photo, drawing your eye to it. it provides "breathing room", giving your eyes somewhere to rest and preventing your image from appearing too cluttered with "stuff". all of this adds up to a more engaging composition.
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no entiendo esa tradición, sorry