Matsya Purana — Cosmic Architecture of Sun–Moon and the ‘Houses of the Gods’
अग्नेर्व्युष्टौ रजन्यां वै ब्रह्मणाव्यक्तयोनिना अव्याकृतमिदं त्वासीन् नैशेन तमसा वृतम् //
agnervyuṣṭau rajanyāṃ vai brahmaṇāvyaktayoninā avyākṛtamidaṃ tvāsīn naiśena tamasā vṛtam //
At the end of the night—when the cosmic fire had subsided—this entire world existed in an unmanifest, unformed state, arising from Brahmā whose source is the Unmanifest, and it was enveloped by the darkness of night.
It depicts a pre-creation/pralaya-like condition where the universe remains avyākṛta (undifferentiated) and covered by tamas (darkness), with manifestation arising from the Unmanifest source associated with Brahmā.
Indirectly, it frames dharma as grounded in cosmic order: just as creation emerges from disorder and darkness into structure, a king or householder is expected to uphold order (niyama) and clarity over chaos in society and personal conduct.
No direct Vāstu or ritual rule is stated; the key takeaway is conceptual—order and form arise from the formless, a principle later mirrored in Vāstu where measured layout (vyakta) is imposed upon undifferentiated space.