Matsya Purana — Brahmā’s Four Faces
प्रायो गन्धगुणा सा तु बुद्धिर् एषा गरीयसी एभिः संपादितं भुङ्क्ते पुरुषः पञ्चविंशकः //
prāyo gandhaguṇā sā tu buddhir eṣā garīyasī ebhiḥ saṃpāditaṃ bhuṅkte puruṣaḥ pañcaviṃśakaḥ //
This buddhi (intellect) is predominantly characterized by the quality of smell, and it is indeed the superior principle. The twenty-fifth tattva, the Puruṣa, experiences (enjoys) what is produced by these principles.
It frames creation philosophically: the Puruṣa (conscious principle) does not “create” materially but experiences the results produced by the evolving tattvas—an analysis often used to explain how manifestation proceeds (and can be reversed conceptually in pralaya) through principles rather than through the Self changing.
By distinguishing the experiencer (Puruṣa) from the instruments and products (tattvas), it supports ethical self-governance: a king or householder should cultivate buddhi (discernment) to regulate sensory life, understanding that pleasures and pains are experienced through conditioned principles rather than being the true nature of the Self.
No direct Vāstu or ritual rule is stated; the relevance is indirect: Vāstu and ritual sections often assume this tattva-framework, where sensory qualities (like gandha/smell linked to earth) and the experiencer (Puruṣa) are distinguished when prescribing purificatory acts and material arrangements.