From Season 4 Episode 6 Explained: Answers to the 5 Biggest Unsolved Questions
The towering stone lighthouse remains the central visual contradiction of the forest. Located inland, far from any natural body of water, it has served as both an exit portal and an execution site. In Episode 6, Jim Matthews and Kenny Liu trek past the faraway trees to reach its base, armed with the coordinates Tabitha brought back from her brief return.
What they encounter defies Euclidean geometry. The distance between the forest edge and the lighthouse shifts dynamically based on the emotional state of those approaching it. When Kenny succumbs to panic over his mother's declining health, the trail lengthens by several miles in minutes. When they pause and regain composure, the structure sits mere yards away.
Inside the base of the lighthouse, they find no stairs ascending upward. Instead, the interior reflects downward into a subterranean shaft that mirrors the monster tunnels below the town. The lighthouse is not an observation post overlooking the realm; it is an intake siphon. The light sweeping over the trees at night does not illuminate escape paths, it marks targets for the entity controlling the landscape.