Danica Stojiljković, Ivan Spasojević
This mini-review presents a case study of an urban photobioreactor Liquid3, which combines microalgae-based air purification with multifunctional urban design to demonstrate the transformative role of bio-inspired techno-environmental innovations. Liquid3 is a public installation designed in accordance with the principles of efficient urban land use, aiming to deliver environmental, social, and economic benefits while addressing key challenges of urban environmental management. Drawing on a transdisciplinary approach, Liquid3 integrates scientific, design, and social perspectives, functioning not only as a technology for CO 2 and particulate matter reduction but also as a driver of societal engagement. The transformative urban design of the Liquid3 photobioreactor fosters environmental awareness, encourages active community engagement, and creates potential for educational applications across diverse cultural contexts. Through social media, Liquid3 may serve as a societal catalyst, reshaping public understanding of ecological processes, the role of technology, and the value of urban greenery, while encouraging civic reflection and new imaginaries for sustainable cities. In terms of its educational potential, Liquid3 may function both as a model of economically viable environmental innovation and as a pedagogical tool. Ultimately, this case study underscores the critical role of transformative urban design as a framework for discussing and reimagining sustainable urban futures.