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In page Mariano Fortuny (designer):
"He used these indirect lighting techniques in his new invention, the Fortuny cyclorama dome, a quarter dome shaped structure of plaster or cloth. Fortuny first filed a patent for his indirect theatrical lighting system in 1901 and constantly refined his invention thereafter.[2] The shape created the look of a more extensive sky and Fortuny could create any type of sky he wanted by reflecting light onto it in a certain way. He could even reflect clouds on the backdrop by painting different things on the mirrors that reflected light onto the dome.
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