How is the 'Unmanifest' or 'causal body' characterized in the scripture?

As detailed in Chapter 50, the 'Unmanifest' (Avyakruta) is synonymous with the 'causal' (karana) body of the soul. Its primary characteristic is being the very cause of pure ignorance, arising from the ignorance of the Soul itself. It is described as that which holds the reflection of consciousness. The text presents a subtle definition, stating that one should know it as 'neither without parts nor with parts, nor both,' highlighting its paradoxical nature that defies simple categorization. This causal body can only be removed through the knowledge of the unity of Brahman and the Soul, which is the key to liberation.