Eighty-sixth technique. The cranial cavern. Kapālāntarmano nyasya — placing the mind within the skull. Not at a specific point. In the interior space of the skull itself. That dark and silent volume where the brain resides but which consciousness experiences as empty space.

Mīlitalocananaḥ — with eyes closed. Tiṣṭhan — remaining thus, still. It is a technique of pure stillness. Close the eyes and inhabit the interior of the head as one inhabits a cave.

Krameṇa manaso dārḍhyāt — gradually, by firmness of mind. It does not happen quickly. It requires patience and stability. Lakṣyam uttamam — the supreme goal. The cranial cavern transforms into the cave of the heart. The interior space expands. The skull walls disappear. Only infinite, luminous, conscious space remains.