Schneider and Till recast architectural agency as the capacity to “act otherwise” within conditions that are neither fully chosen nor fully controllable. Their decisive move is to displace the architect from heroic authorship toward a distributed field of co-production in which expertise remains consequential but no longer monopolises authority. Spatial agency therefore names a temporal and political continuity between intention, material mediation, occupation and subsequent transformation. Methodologically, the essay joins critical theory to situated episodes of practice: critique matters only insofar as it can enter practical consciousness, negotiation, intuition and collective action. Power is correspondingly reformulated as the capacity to enable others to take control of their environment rather than as unilateral command. The argument makes a precise bridge from architectural theory to the sociology of agency and the politics of participation, while also anticipating relational accounts in which buildings, institutions, users and professionals form interdependent chains of responsibility rather than separable domains.