Castel's intense fixation on Maria consumes his every thought and action. From their first encounter, where he observes her gazing at his painting, he becomes convinced that she possesses a unique understanding of his soul. However, this belief quickly spirals into an obsessive need to possess her entirely, leading to fits of jealousy and paranoia that ultimately destroy their relationship.

Throughout the novel, Castel erects metaphorical and literal walls between himself and the world. He grapples with a profound sense of isolation, convinced of his own intellectual superiority and unable to find meaningful connection with others. This inability to bridge the gap between himself and others fuels his despair and drives his destructive behavior.

Castel desperately seeks meaning and validation in a world he perceives as indifferent and absurd. He sees in Maria a kindred spirit, someone who can penetrate the depths of his soul and offer the understanding he craves. However, his own distorted perceptions and inability to communicate effectively sabotage his pursuit of connection, leaving him even more lost and alone.