Undergraduate Approach documents the pedagogical, cultural, and intellectual life of the College of Architecture at the Sam Fox School of Design & Visual Arts at Washington University in St. Louis. Each thematic issue focuses on a particular aspect of the undergraduate architecture program, providing a snapshot of the educational approach, visual language, and experimental ethos that permeate the College. Issue 25, {Fluid} Approach, focuses on a series of studios that engage with aspects of fluidity—from the material explorations of water and watersheds, to the conceptual notion of liquidity in architecture and urbanism. It presents a selection of work generated by the fifth-semester core studio titled Water: Liquid Tectonics, as well as from a selection of Option Studios that were taught between 2012 and 2016, all of which engaged various facets of fluidity.