And the subtlety of objects ends in the unmanifest.

The objects of meditation become progressively more subtle until reaching aliṅga — the “without mark,” the unmanifest, primordial nature (prakṛti) in its latent state before all manifestation.

This is the boundary between the manifest and unmanifest, between the phenomenal world and its source. Beyond aliṅga is Puruṣa — pure consciousness that is not an object at all.

Samādhi on aliṅga is the highest level of absorption with seed. There is still a subtle “object” of meditation. The final step is to transcend even this.