<p dir="ltr">This publication is intended to inform research, practice, and public discussions on the role of surfaces in urban environments.</p><p dir="ltr">The publication is the result of the fourth international workshop of the Urban Surfaces Research Network (USRN), established in 2023 by Sabina Andron, Konstantinos Avramidis, and Tom Ward. The workshop took place online on 25 September 2025.</p><p dir="ltr">The USRN brings together researchers, practitioners, and policy makers, to examine the roles and uses of urban surfaces, and their contribution to the formation of urban cultures, politics, and atmospheres. It is a multidisciplinary group held together by a shared empirical interest and a passion to untangle the affordances of surfaces for citizenship, belonging, media, economy, law, and justice - the list continues.</p><p dir="ltr">USRN Vol 4 contributors: Elijah Agwaru Anomet (Independent Artist, Uganda), Natalie Bauer (KU Leuven), Taylor Coyne (University of New South Wales), Tom Critchley (Northeastern University), Megan Hicks (Independent Researcher, Australia), Joumana Ibrahim (University of the Arts London), Christoph Lueder (Kingston University London), Nian Paul (University College London), Lorenzo “SERRAGLIA” Servi (Independent Artist, Finland), Pierre-Édouard Weill (Université de Bretagne Occidentale)</p><p dir="ltr">Each contributor addresses the following prompts:</p><p dir="ltr">1. DEFINE: How do you define urban surfaces in your field or practice?</p><p dir="ltr">2. INTERVENE: If you could change one thing about how urban surfaces are designed, valued, maintained, or governed—what would it be?</p><p dir="ltr">3. CHALLENGE: What is a common misconception about urban surfaces that frustrates or limits your work?</p><p dir="ltr">We hope you enjoy your journey through these incredibly wide-ranging responses and share our enthusiasm for the traction of surface knowledges in our ongoing series.</p>