* '''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|frame|left|Image reproduced from [https://commons.wikimedia.org/wiki/File:Vibrations_damping.svg here]]]

[[File:NSI5.gif|frame|center|Image reproduced form [https://commons.wikimedia.org/wiki/File:Vibrations_damping.svg here]]]

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