According to Osho, Lao Tzu’s Tao is the supreme law of existence (Rta/Dharma), Ashtavakra’s witness is the method—pure, uncovered awareness—by which it is known, and tathata (suchness) is the realization: dissolving into that law. Their difference is functional—principle, path, attainment—while their commonality is total: three faces of one reality, a distinction without division.
Tao is the ocean, witnessing is waking up and walking to it, and tathata is the river losing itself in the ocean—same water, different moments.