 Still another puzzling claim added to Fechner’s theory is what he calls “the most universal law of psychophysics”: that nothing exists, originates or acts in the mind without something existing, originating or acting in the body; in other words, everything mental has its expression in the physical (1861: 211). This principle seems to bias the connection between mind and body, so that the mind appears as the body but not conversely; but the theory originally called for a reciprocal connection or interaction between mind and body (as we have just seen above).