A significant Yadava Dynasty temple has been identified in the Marathwada region of Maharashtra, showcasing a sophisticated method of interior illumination. The temple's mandapa (hall) contains a series of narrow floor channels that were once filled with liquid mercury. These channels acted as mirrors, reflecting sunlight from specifically positioned roof apertures deep into the inner sanctum.
This 'reflective-mercury' system allowed for the temple's interior to be illuminated even during the late afternoon, creating a golden glow around the deity. While the mercury has long since evaporated or been removed, chemical residues found in the stone troughs confirm the method. Restoration experts are currently debating whether to simulate the effect using modern non-toxic materials to showcase this medieval optical feat to visitors.