 The act-object duality embedded in our ordinary concept of pain yields strange results when followed intuitively and naively to its logical end. But perhaps this duality is a robust symptom of a deeper truth underlying all perception and introspection. Perhaps pain is simply the most paradigmatic example of a broad range of perceptual experiences where this deep underlying iceberg shows its tip most prominently and revealingly — albeit confusedly. Indeed this is exactly the case according to so-called sense-datum theories.