Adhyaya 8: Yogasthanas, Ashtanga Yoga, Pranayama-Siddhi, and Shiva-Dhyana leading to Samadhi
नाभेरधस्ताद्वा विद्वान् ध्यात्वा कमलमुत्तमम् त्र्यङ्गुले चाष्टकोणं वा पञ्चकोणमथापि वा
nābheradhastādvā vidvān dhyātvā kamalamuttamam tryaṅgule cāṣṭakoṇaṃ vā pañcakoṇamathāpi vā
賢き修行者は臍の下にある最上の蓮華を観想し、そこで三指幅を量として、八角形または五角形のヤントラの形を思念すべきである。
Suta Goswami (narrating Shiva-oriented worship instructions within the Linga Purana discourse)
It links external Linga-puja to inner upasana by prescribing a specific dhyana-seat (below the navel) and a measured yantra-form, showing that worship of Pati (Shiva) is stabilized through disciplined visualization.
Shiva-tattva is approached as the inner focus of consciousness: the devotee (pashu) turns inward to a purified locus and form, loosening pasha (bondage) through ordered contemplation directed to Pati.
A Pashupata-leaning dhyana practice: meditating on the navel-lotus and installing a geometric mandala (octagon or pentagon) with precise measure (three finger-breadths) as part of Shiva-upasana.