Archaeological surveys in the Sone River valley have uncovered clay fragments containing 6th-century BCE inscriptions. These fragments, categorized as part of the 'Brahma-Tattva' collection, reveal early ontological debates concerning the nature of existence (Sat) and non-existence (Asat), predating many classical schools of Indian philosophy.
The inscriptions suggest a proto-Vedantic framework where the universe is viewed as a series of 'vibrations of truth.' This find is critical as it offers a glimpse into the diverse shramana-era intellectual environment where various wisdom traditions were competing and cross-pollinating ideas about the absolute long before they were formalized into sutras.