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Researchers at the University of Sydney’s School of Architecture, Design, and Planning have been pioneering the development of acoustically retroreflective surfaces, which redirect sound back to its source. Retroreflectors have familiar applications in optics, such and bicycle reflectors and road signs, but their application in acoustics remains uncommon. Their work aims to explore how to optimise the design of these surfaces for sound and explore their practical applications in improving speech clarity within rooms.