Within the depth-psychology corpus, ‘laboratory’ operates across several distinct registers that collectively map the tensions between scientific objectivity and psychological interiority. In its most literal deployment, the laboratory figures as the institutional site of empirical neuroscience — the physical space where Kandel and colleagues discovered that working at the bench is ‘dramatically different from taking courses and reading about science,’ a revelation that transformed psychoanalytic ambition into biological vocation. A second, historically charged register appears in alchemical psychology: Edinger and Hillman read the alchemical laboratory as the originating scene of depth psychology itself, the grimy furnace-room where Greek philosophy was reconnected to matter and where the soul’s projections onto substance first became legible. Hillman further traces the laboratory’s emergence in early modernity — through Boyle, Van Helmont, Lavoisier — as the moment when alchemy’s ‘subjective mysticism’ was exteriorized into experimental science, with lasting consequences for how psyche relates to world. A third register, prominent in psychedelic research (Strassman) and addiction studies (Alexander), treats the laboratory as a bureaucratic and methodological problem: the site of purity testing, regulatory compliance, and the contested validity of findings extrapolated from controlled conditions to lived experience. Sleep research adds a fourth dimension, with Bulkeley probing whether the sleep laboratory distorts the very phenomena it seeks to measure. Across all these registers, the laboratory signifies both the promise of verifiable knowledge and the risk of a reductive exile of soul from nature.