One of the enduring questions in cognitive science is: Why do individuals experience the same objective event in fundamentally different ways? The variability of subjective experience has been traditionally explained through environmental, developmental, or neurobiological factors. This paper proposes an additional, largely under-explored layer: the structured difference in mental architecture, accessible through controlled sensory stimulation. The project hosted at www.mindgraphy.eu introduces a simulation model for psychological life that identifies correlations between external stimuli and internal mental objects. This framework is built on the idea that perception acts as a gateway to cognition, and thus, by modulating stimuli, one can infer the unique structure of an individual’s mental world.