To build upon the discussions initiated by Rutger de Graaf on floating urbanism at the recent WCFS conferences, this document aims to not only delve into the potential of reimagining street spaces in floating cities but also to shed light on the innovative concept of “floating urbanism,” which envisions cities free from traditional streets. It critically examines and reimagines the foundational principles of urban planning, positing the provocative idea that cities might not require streets to serve as their backbone. Thought an experiment made during the SIP (Pedagogical Week Innovation) in ULB (University Libre de Bruxelles) in March 2024, the students were invited to work on conceptual exercises to rethink street functions in urban design, based on the idea that the absence can create new perspectives of mobility. From Tim Ingold's work, students were tasked to reimagining urban mobility and space in existing cities built without streets, Catalhoyuk in Turkey, Ganvié in Benim and Uros in Peru. The methodology consists of three steps: first, developing the DNA of each given city model. Then, by using creative thinking techniques, such as mind mapping and SCAMPER, generate innovative ideas on 5 key mobility concepts: mobility of memory, mobility in time, mobility for networks and generative infrastructure, and mobility for division. Finally, by overlayering the 3d models obtained, we have produced a series of prototypes of innovative mobility in cities. The text shows how floating urbanism offers new potentialities, emphasising ecological management, community spaces, adaptability to climate change, and integrated mobility networks in time motion.