Public art installations are pivotal in reshaping urban spaces, inducing paradigm shifts in societal perceptions. These interventions serve as transformative catalysts, reshaping conventional urban environments and instigating dynamic dialogues among art, architecture, and communities. By intervening in public spaces, these installations challenge established norms, allowing citizens to directly engage with art in their daily surroundings. This not only democratizes art access but also encourages the community’s appropriation and reinterpretation of space, fostering a sense of shared ownership. In this context, PUL, the Piscina Urbana de Logroño, emerged, winning the CONCENTRICO festival of architecture and urban art. It stands as an installation where rules are unwritten, emphasizing spontaneity and the unbridled appropriation of interior space. Situated in Plaza de las Escuelas Trevijano, Logroño, Spain, the ephemeral pool seamlessly integrates with existing elements, encircling the central tree. The plaza and its rigid urban furniture, designed for transit and brief stops, create an inhospitable environment for social interaction. The new Piscina Urbana de Logroño aims to enclose a section of the plaza, creating a soft public space dedicated to leisure and care. PUL, being mountable, demountable, and easily transportable, holds the potential to soften other city squares in the future. Comprising 39 wooden modules resembling mobile tanks, each containing three yoga balls, the installation empowers users to determine the pool’s fullness and usage through the spontaneous release of yoga balls. This abstract delves into the substantial impact of public art installations on reshaping urban landscapes, showcasing their potential to instigate paradigm shifts and foster active, reflective societal participation through a real and practical case study (PUL). Additionally, the Logroño installation has been exhibited in Nuevos Ministerios, Madrid, and Damman, Saudi Arabia.