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Core Viewpoint - The article discusses the emerging trend of eliminating rear windows in car designs, exemplified by models like Polestar 4 and Polestar 5, which utilize advanced camera technology to replace traditional rear windows, indicating a significant shift in automotive design philosophy driven by technological advancements [3][6][11]. Design Innovations - Polestar 4 features a "no rear window" design, replacing it with a solid panel and a wide-angle camera that streams real-time images to an internal display [3]. - Other brands like Jaguar, Audi, and Ferrari are also moving towards designs with closed rear ends or minimal window openings, indicating a broader industry trend [6][8]. - Audi's Concept C integrates narrow horizontal slits at the rear for light and aesthetic purposes, while Ferrari's 812 Competizione uses solid aluminum to enhance aerodynamics and performance aesthetics [10][12]. Technological Drivers - The shift towards no rear windows is attributed to advancements in technology, including high-definition external cameras and internal displays, which allow for improved visibility without the need for glass [14][15]. - The design changes are also influenced by safety standards that require stronger vehicle structures, which inadvertently reduce rear visibility [12][14]. Historical Context - The concept of cars without rear windows is not new; historical models from the 1930s, such as the KdF V30 prototype and Tatra 77, also featured designs that minimized or eliminated rear visibility for aerodynamic benefits [16][19]. - Legal frameworks, such as the U.S. Federal Motor Vehicle Safety Standards, allow for alternative visibility solutions, providing a regulatory basis for the adoption of camera systems instead of traditional windows [23]. Controversies and User Experience - There are ongoing debates regarding the impact of no rear windows on passenger experience and driver visibility, with some users expressing discomfort and concerns about the reliance on camera systems [24][25]. - While 90% of Polestar 4 customers reportedly accept the design, issues such as a sense of enclosure for rear passengers and the need for drivers to adapt to the absence of a rear window remain significant challenges [25][27]. - Critics argue that the benefits of removing the rear window must be weighed against potential drawbacks in user experience, especially before the full realization of autonomous driving technology [29].