The Pre-Session Co-Therapist: Co-Designing Atmospheres of Agency in Child and Adolescent Psychiatry

In child and adolescent psychiatry, the pre-consultation interval, situated in the waiting area, is not a passive administrative phase but a critical determinant of clinical engagement. It acts as a liminal threshold where the civilian subject transitions into the patient role. However, standard hospital environments often feature clinical sterility and surveillance-oriented aesthetics, conditions that exacerbate anticipatory anxiety, induce behavioral inhibition, and compromise the therapeutic alliance. Drawing on frameworks from institutional psychotherapy and eco-phenomenology, this study positions the built environment as an active variable in treatment outcomes. To operationalize this impact, we applied a five-dimensional systemic framework, assessing complexity, entropy, negentropy, position, and trajectory, to analyze clinician feedback on admission bottlenecks. This diagnostic process revealed that intake scenarios typically suffer from high environmental entropy (unpredictability of the clinical process) and a marginalized subject position (systematic exclusion of patient agency). In response, we analyze a site-specific intervention at the Maison de l'enfance et de l'adolescence (MEA) in Geneva, Switzerland: a co-designed paper-and-light installation paired with patient-led "check-in cards." We theorize the installation’s clinical utility through a quadripartite functional model, expanding Delion’s triad (phoric, semaphoric, metaphoric) with a proposed fourth dimension of the aesthetic function (care through sensory transformation). We demonstrate that creative practices support social cohesion and clinical utility only when: (1) co-designed across sectors (democratizing safety protocols); (2) supported by dedicated coordination (embedding artistic affordances into risk protocols); and (3) given institutional time to bridge the epistemological gap between clinical logic and patient experience. Ultimately, the intervention functions as a "pre-session cotherapist," transforming the wait into a therapeutic rite of passage and validating atmospheric design as a structural necessity for democratic healthcare infrastructure.