A cache of 5th-century Vakataka-era copper plates has been unearthed during road construction in the Vidarbha region of Maharashtra. The inscriptions on the plates, titled the 'Rta-Setu', describe a unique philosophical system centered on the concept of 'Cosmic Bridges'—the invisible ethical links that bind the individual, the community, and the natural world together in a state of Rta (cosmic order).
The text outlines a series of 'Nitya-Karma' (daily duties) that are redefined not as religious rituals, but as ecological and social responsibilities intended to maintain the stability of these cosmic bridges. Historians note that the Rta-Setu provides one of the earliest known philosophical justifications for environmental conservation based on the intrinsic value of natural systems rather than human utility.