Ian Donnelly
Ian Donnelly is not a simple scientist but a theoretical physicist responsible for the film's philosophical depth. Through contact with alien civilisation, he poses a fundamental question about the concept of 'the linearity of time' itself — long taken for granted by humanity. Adding a physical perspective to Louise's linguistic interpretation, he builds the core setting that the aliens' mode of thought follows the non-linear concept of time in which past, present, and future coexist simultaneously.
Introducing the Scientific Perspective: Beyond Linguistics to Physics
Ian Donnelly is a key figure who raises scientific questions about Louise Banks' linguistic approach to communicating with the aliens, heightening the intellectual tension of the work. When Louise emphasised the importance of language in her introduction — 'Language is the foundation of civilization. It is the glue that holds a people together. It is the first weapon drawn in a conflict.' — Ian retorts decisively. To him, the foundation of civilisation is not language but 'science.' This opposition structure is the decisive opportunity that extends the film's themes beyond simply 'communication' to the physical dimension of 'the fundamental way humans understand the world.'
Establishing the Non-linear Concept of Time
Ian's most important contribution is to propose the concept that the aliens' language and mode of thought do not follow the human linear flow of time. Drawing on the aliens' appearance, in the process of giving them the name 'Heptapod,' he realises that the aliens' very language does not distinguish the flow of time forward and backward. This means, beyond a mere translation problem, that the very cognitive architecture of humanity must be reset.
Ian poses Louise the following academic question: 'There is a theory that a person's thought is shaped by the language they use — so if Louise is learning the Heptapods' script, will she come to think the same way they do?' This question hints to the audience that Louise's journey is not mere knowledge acquisition, but a process of ontological transformation.
The Danger of Misunderstanding: The Analogy of Chess and Language
Ian warns of the danger of misunderstanding that can arise in the communication process through specific analogies. His point that Louise might be influenced by the rules of mahjong in the process of communicating with the aliens shows that language learning is deeply connected to cultural context. In particular, he uses Western chess as an example, noting that chess may create the danger of understanding language through the concepts of 'battle and victory' — capturing and defeating the opponent's pieces. This is a very important academic brake, warning that Louise may too easily interpret the 'Offer weapon' message the aliens transmit through the linear concept of 'threat.'
Role in the Climax: The Completion of Interpretation
In the film's climax, Ian's role reaches its peak in the process of an explosion occurring inside the alien spacecraft and Louise and Ian escaping. They study the black substance and letters that the Heptapods scattered just before the explosion. Ian reveals that these letters are connected not to mere script but to the 'concept of time,' providing the decisive scientific interpretation that enables Louise to understand alien civilisation. Through this, Louise's linguistic insight and Ian's physical insight combine to complete the revelation that the crisis humanity faces is not a simple alien invasion but a fundamental question about the way humanity perceives time.
Why It Matters
Ian Donnelly is the philosophical skeleton of this work. If Louise approaches from the emotional and cultural domain of 'communication,' Ian approaches from the rational and structural domain of 'scientific principles.' His existence is the core driving force that elevates the film from a SF thriller merely dealing with alien contact to a deep philosophical drama exploring human cognitive architecture, the nature of time, and the inseparable relationship between language and thought. The concept of non-linear time he proposes delivers the shocking thought to audiences that 'the time we know is in fact just one perspective' — completing the work's identity.
Other Character dives4
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General Shang
General Shang is a figure symbolising national anxiety and distrust in the process of contact with alien civilisation. The decisions of the PLA he commands — based on the mistranslated message that the aliens are 'offering weapons' — become the decisive trigger for exploding global conflict and cutting communications between twelve nations. He dramatically shows the danger of the collective fear and nationalistic response humanity experiences before an unknown entity.
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Louise Banks
Louise Banks is far more than a simple linguist — she is the figure who confronts the shocking truth, through contact with alien civilisation, that humanity's very concept of time may be an error. Her journey is the process of exploring the relationship between language and modes of thought, ultimately posing a philosophical question about humanity's destiny by understanding the non-linear concept of time in which past, present, and future coexist simultaneously.
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Colonel Weber
Colonel Weber is a figure who symbolises the collision point between military tension and scientific inquiry in the process of contact with alien civilisation. Initially leading the assessment of immediate threat and wariness toward the alien life forms, through cooperation with Louise Banks he comes to realise that 'communication' must take precedence over 'force' for the survival of the human race.

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Arrival
14 deep dives in total