The non-linearity of time and the meaning of existence

The Linear Illusion and the Non-linear Truth of Time

The most fundamental question Arrival poses is 'What is time?' Humans perceive the flow of time as a clearly defined, linear structure: Past → Present → Future. But the alien civilisation Heptapod transcends this human concept of time. They hold a non-linear view in which every moment exists simultaneously — knowledge that Louise Banks gradually acquires through the process of deciphering their language.

This non-linear mode of thought, beyond the physical concept of time alone, redefines humanity's 'ontological time.' The moment Louise accepts this perspective, she breaks free of time's constraints and perceives her entire life as a single, complete circle. This immediately conveys a sense of liberation: 'every moment of life is connected, and concepts like regret or longing do not exist.'

📚 The Difference in 'Free Will' Between the Novel and the Film

To fully understand this theme, it is essential to compare the interpretations of the source novel and the film. Both approach the narrative from a fatalistic perspective, but they show a decisive difference in how they handle 'free will.'

1. The Novel's Strict Determinism:
In the novel, the logic that the future cannot be changed and free will does not exist is dominant. Both the protagonist and the Heptapods perceive the future but, since attempting to change it would create a logical paradox, they simply accept and act on the future as perceived. In other words, knowing the future induces a sense of 'obligation,' and free will and knowing the future cannot coexist. From this perspective, the events of Louise's life (divorce, her daughter's death) are portrayed as an inevitable flow.

2. The Film's 'Choice within Destiny':
The film, by contrast, leaves room for 'choice' within this determinism. Louise perceives the future, and even if it is painful, she acquires the agency to 'choose' to live through those moments. This is most starkly evident in the narrative of Louise's daughter. Unlike the novel — where the daughter's death is presented as a fall during rock climbing that free will could easily have prevented — the film changes the cause to a terminal illness that modern medicine cannot cure. This change of setting portrays Louise as choosing to spend precious time with her daughter while knowing of her inevitable death, emphasising human agency in choosing the most meaningful way to live within fate.

🧠 Language Acquisition and the Transformation of Thought

The Heptapod language is more than a means of communication; it is a tool that restructures Louise's very mode of thought. As Ian Donnelly notes, the hypothesis that 'a person's thought is shaped by the language they use' applies here. The more Louise learns the Heptapods' non-linear script and assimilates to their mode of thought, the more she transcends the constraints of linear thinking and gains a new perspective on time and existence. This is the basis on which Louise moves beyond being a mere linguist to serve as a philosophical mediator on whom the survival of the human race depends.