From: The World In Your Head by Steven Lehar

Fig. 8.4 (A) A bank of three resonators tuned to the frequencies of three specific standing-wave patterns is coupled to the plate to behave as feature detectors that become active whenever their pattern of standing waves is present on the plate. (B) The system automatically performs reification with recognition, for the activation of any of the resonators regenerates its characteristic standing-wave pattern back on the plate. (C) If the plate is resting on rubber ridges in the form of one of the standing-wave patterns, the ridges behave as an input pattern, forcing the resonance on the plate to conform to the pattern of the input.