Matsya Purana — Description of Gomedaka and Puṣkara Dvīpas; the Lokāloka Boundary; Ocean Tide...
भवन्त्यन्योन्यहीनानि परस्परसमाश्रयात् तथा ह्यालोक आकाशे भेदास्त्वन्तर्गतागताः //
bhavantyanyonyahīnāni parasparasamāśrayāt tathā hyāloka ākāśe bhedāstvantargatāgatāḥ //
Because they mutually depend upon one another, each becomes ‘incomplete’ when taken in isolation. So too, in the case of light and space, the distinctions are not absolute—those differences arise within them and pass back into them.
It implies that apparent distinctions among principles are contingent and internal; during dissolution, differences subside back into their supporting reality rather than remaining independent absolutes.
It supports an ethics of relational duty: a king or householder should not act as if beings and roles are isolated, but uphold society through mutual support—seeing governance, charity, ritual, and livelihood as interdependent.
Indirectly, it reinforces a Vastu/ritual principle: space (ākāśa) and light (āloka) are foundational conditions; design and rites should respect their functional interdependence (orientation, openings, illumination), since ‘differences’ are contextual rather than absolute.