negative or harmonic
Attractive refers to the effects a transmitted vibration or sound vibration has on objects within its range of influence (acoustic or sound field). This phenomenon is sometimes misunderstood and mislabeled as absorption. Should any object in that range of influence (acoustic field) have within its own naturally occuring vibration signature (eigenfrequency) a pitch or pitches that are equal to any of the created and transmitted pitches it will respond sympathetically. These are then harmonic pitches (of unison, as also multiples or divisions of unison) and will go into synchronous sympathetic resonance with the impacting external vibrations. If the receiving or absorbing object is naturally harmonic to the transmitting object and the transmissive waves an attraction between the two will result in direct proportion to the sound force, quantity and quality of the harmonicity (sympathy). This behavior is in accord with the Law of Attraction.

Law of Force
"Energy manifests itself in three forms: Creative, the vibrating aggregate; Transmissive, being the propagation of isochronous waves through the media in which it is immersed; Attractive, being its action upon other aggregates capable of vibrating in unisons or harmony." Keely, 1893