A closer look
Long before sensory deprivation tanks became a Silicon Valley productivity trend, the ancient Bon tradition of Tibet perfected the dark retreat. Practitioners seal themselves in total darkness to practice Thogal, a hyper-advanced visionary technique. Without external light, the mind projects its own internal luminosity. The ascetic passes through terrifying demonic visions and eventually witnesses glowing mandalas, proving the entire physical universe is merely an optical illusion.
