The 2023 theme of the Chicago Architecture Biennial curated by the Floating Museum, takes an expansive view of design as an iterative rehearsal process to explore architecture, cities, and the different social, ecological, economic, and political forces that shape them. SANDBOX FOR THE PHYGITAL FUTURE - the theme of the 2023 ArchAgenda Debates - delves into the emergent blend of digital and physical environments shaping a novel seamless social reality. The series envisions the city and metaverse as as symbiotic spaces to rehearse, inform, challenge, test and design the phygital future. The 2023 ArchAgenda Debates features a series of presentations by practicing architects and their students, bridging together research and design in academia and industry. Each presenter is asked to propose a thesis for the evolving phygital narrative. Design presentations and thought-provoking debates aim to collectively explore ideas about future phygital cities.