Forced perspective is an interesting form of art. Its a way of bringing the audiences' attention to a certain object or character. If you were to take a picture or film a clip of a woman surrounded in a rainbow of flowers and objects and her outfit were the same colors it would be hard to focus on her. But if you force perspective by either bringing her into focus and everything else out of of focus, center her, or add contrast to her outfit and complexion you can regain people's focus and make everything seem less hectic.
When the principles and elements are present in design
"Printers used woodcuts to print illustrations by the relief process and experimented with intaglio in copper engravings. Woodcut pictures were produced before metal types, and it was a simple development to make woodcuts in appropriate dimensions for use with type to print illustrated books." -Another website
<em>Rephrased:</em>
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Early printers used woodcuts to display images by the process of relief- this was experimented by intaglio in copper shapes and strokes. Woodcut photographs were made before mineral and metal options, and it was basic development to form woodcuts correctly to be used in making book illustrations and designs.
*Hope it helped :)