But he wasn't satisfied with just that. He carefully picked out a few pieces of burning charcoal from the main fire with a long branch and placed them on both sides of the cave, deeper and close to the cave walls. Soon, two small piles of fire were also ignited.
"Three fires, arranged in a triangular layout," he explained to the camera, "The central main fire is the primary source of light, warmth, and deterrence. The side fires create more dimensional light and heat radiation, completely eliminating the dark corners deep in the cave."
"More importantly, the smoke they generate can effectively drive away unseen guests hiding in the rock crevices, such as scorpions, centipedes, or some poisonous spiders."
The flickering flames illuminated the entire rock shelter, leaving no shadows to hide in.
The fire itself is a psychological and physical barrier.
Lin Yu'an sat behind the fire, leaning against the warm and solid cave wall, feeling an unprecedented sense of security.
