 The conception of causality at work here has come to be labeled with the Chinese phrase ganying 感應, “stimulus and response”. This way of approaching causality reflects the fact that existence is inherently active and dynamic: an effect is never purely passive or inert, and a cause works with the tendencies of the thing affected. The effects of a stimulus depend on the receptive and responsive capacities of the thing stimulated. One common model for ganying was resonance, as in the quotation above where the vibrations of one string stimulate vibrations in strings tuned to the same note.