The shiva-shakti tattvas, the two highest tattvas, are completely subjective. The shiva tattva is, according to the philosophy, the ultimate reality, the pure “I,” undiminished and undifferentiated consciousness. As something purely subjective, it is both everywhere and nowhere, in every being and simultaneously beyond them. It is not dissimilar to Hegel’s Absolute (though I believe Douglas Brooks, who knows far more than I in this area, might disagree with me on this one), which “is and is not,” or Kant’s “unmoved mover.”
Shakti tattva is power — the power to tranform, create, manifest, diversify, cloak. Shakti is the power to become embodied in objective form. Shiva and shakti tattvas are thus inseparable. Ultimate unbounded consciousness and freedom (shiva) only has meaning to the extent the power to move, create, and diversify (shakti) pulses and transforms the subjective into the objective, the unimaginable to the observable.
In our yoga practice and meditation, we seek to use the practices to reveal to ourselves the ultimate pulsation (spanda) between the objective and subjective, the observable and the unknowable, the individual and the completely universal. One way I experience the first principle of Anusara yoga (open to grace), is taking the mat or my seat with an openness to sense and experience this ultimate pulsation (spanda) and play (lila), so that by using my body, mind, and will, I can better recognize the spirit that shines in all of us and use that recognition to inform how I relate to myself, society, and all beings.