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The "Big Sur RC1" (Release Candidate 1) suite is a community-developed project designed to bring these visual elements to the Windows desktop. Unlike previous iterations of macOS-inspired skins which focused on "Yosemite" or "Mojave" flat aesthetics, Big Sur RC1 addresses the complexity of translucency, blur effects (Acrylic/Mica), and rounded geometry. big sur rc1 for rainmeter