The lighthouse is the novel’s central symbol, representing the catastrophic failure of human systems of knowledge and safety when confronted by an incomprehensible power. Traditionally a beacon of guidance and rational order, the lighthouse becomes the point of origin for a world that subverts and dismantles every system of knowledge humans use to try to understand it. For Saul Evans, the lighthouse is initially a refuge where he finds peace in routine, but it becomes the site where Area X’s influence enters him through the immortal plant, initiating the loss of his identity. The Séance & Science Brigade also uses it as a base for their flawed experiments, a futile attempt to rationalize the uncanny. 

The novel deepens this symbolism through the lighthouse’s uncanny double, the subterranean Tunnel/Tower, an inverted beacon that descends into the earth. While the lighthouse represents humanity’s upward-striving attempt at empirical mastery, the Tunnel/Tower symbolizes a descent into the unknowable. With its ability to produce bioluminescent words in its “skin,”—words that vanish as fast as they appear and are often illegible or incomprehensible—it evokes the biblical Tower of Babel, an allegory for humanity’s futile effort to attain Godlike omniscience. Saul’s final transformation into the Crawler inside this space confirms that both structures serve as conduits for Area X. The repeated destruction of the lighthouses, as in Saul’s vision of a “thousand lighthouses burned to columns of ash” (197), symbolizes the complete collapse of humanity’s claim to understanding and control, leaving only the ruins of its failed attempts.