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* '''Vertical Motion Isolation:'''
It uses a conventional spring connected to a Negative Stiffness Isolator (NSI) consisting of two bars hinged at the center. The stiffness of the isolator is K=KS-KN where KS is the spring stiffness and KN is the magnitude of a negative-stiffness which is a function of the length of the bars and the load P.
* '''Horizontal Motion Isolation:'''
The beam-columns have horizontal stiffness Ks with the weight load applied laterally. Due to this the lateral bending stiffness is reduced by the "beam-column" effect. This behavior is equivalent to a horizontal spring combined with an NSI so that the horizontal stiffness is K=Ks-Kn, and Kn is the magnitude of the beam-column effect.
[[File:NSI2.png|framethumb|left|400px|Horizontal motion isolation. Image reproduced from [https://commons.wikimedia.org/wiki/File:Vibrations_damping.svg here]]][[File:NSI3NSI6.gifjpg|framethumb|center|Image reproduced from [https://www400px|Six DOF Single Isolator.minusk.com/content/technology/how-it-works_passive_vibration_isolator.html here]]][[File:NSI4.gif|frame|left|Image reproduced from [httpsAttribution://www.minusk.com/content/technology/how-itBy Sdv1120 -works_passive_vibration_isolator.html here]]][[File:NSI5.gif|frame|center|Image reproduced form [Own work, Public Domain, https://commons.wikimedia.org/wikiw/File:Vibrations_dampingindex.svg here]php?curid=10530707]]
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