Are some things unknowable?
TOK Exhibition Prompt 18 — Object Examples & Rationale
A complete, examiner-written breakdown of IB TOK Exhibition IA Prompt 18 — five worked object examples exploring the limits of human knowledge, linked optional themes, knowledge questions and top-band commentary for IB DP May 2026.
The Prompt
“Are some things unknowable?” — Prompt 18 of the 35 prescribed IA prompts.
Assessment Weight
TOK exhibition = one-third of your final TOK grade.
Word Count
950 words max across all 3 objects combined (plus references).
Session
Updated & mapped for TOK assessment.
Decoding Prompt 18 – “Are some things unknowable?”
IB TOK Exhibition Prompt 18 invites students to confront one of the deepest questions in epistemology: are there limits to what humans can know, and if so, what defines those limits? The prompt pushes you beyond surface-level definitions and asks you to examine the boundaries of human cognition, perception, technology and language that may render certain truths permanently inaccessible. For a strong exhibition, each of your three objects must reveal a different angle on these limits — whether through the vastness of the cosmos, the privacy of consciousness, the loss of linguistic context, or the strangeness of quantum reality.
A top-scoring IB TOK exhibition on Prompt 18 does three things well: it links each object to a specific real-world context that signals an epistemic limit, it justifies why that object exemplifies unknowability through a clear knowledge claim, and it connects back to an optional theme or area of knowledge.
TOK Exhibition Objects for Prompt 18
Each example below includes the object, linked optional theme, examiner-written rationale, and a knowledge question to extend your analysis.
The Voyager Golden Records
The Voyager Golden Records, included aboard the Voyager spacecrafts, contain sounds and images selected to portray the diversity of life and culture on Earth, intended for any extraterrestrial life or future humans who might find them. This object exemplifies the human endeavour to communicate across the vast unknowns of space and time, confronting the inherent limitations in our ability to ensure that such messages can ever be deciphered or understood by non-human intelligence. It raises profound questions about the limits of communication and the possibility that certain aspects of human knowledge, culture, and experience may remain forever unknowable to other forms of consciousness, should they exist.
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- Ready-to-submit commentary within 950-word limit
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The James Webb Space Telescope (JWST)
The JWST, designed to observe the most distant galaxies, represents humanity’s attempt to push the boundaries of cosmic knowledge. Despite its unprecedented capabilities, the JWST also symbolises the inherent limitations of our quest to fully understand the universe. It underscores the idea that the vastness of the cosmos, the origins of existence, and the nature of dark matter may contain elements that are fundamentally unknowable, given the constraints of current technology and the limitations imposed by the speed of light and the size of the observable universe.
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A Locked Diary with a Lost Key
A locked diary, for which the key has been lost, serves as a metaphor for the personal or subjective knowledge that remains inaccessible to others. It represents the idea that some experiences, thoughts, and emotions are inherently private or internal, making them unknowable to anyone but the individual who possesses them. This object invites discussion on the nature of subjective experience and the limits of empathy and understanding, highlighting the privacy of consciousness as a domain of unknowable knowledge.
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2 More Objects for Prompt 18
Two additional examiner-written object examples to help you finalise your TOK exhibition selection.
A Fragment of an Ancient Language’s Undeciphered Script
Fragments of undeciphered scripts from ancient civilisations, such as the Indus script, embody the challenge of unlocking knowledge that has lost its contextual and linguistic framework. These artefacts represent the idea that without a Rosetta Stone-like key, the knowledge contained within these languages may remain permanently beyond our grasp, illustrating the critical role of language in transmitting knowledge across time and the potential for historical knowledge to become unknowable when linguistic links are severed.
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Quantum Entanglement Experiment Setup
Quantum entanglement experiments, which demonstrate the instantaneous connection between particles regardless of distance, confront the limits of classical physics and our understanding of the universe. These experiments highlight aspects of quantum mechanics that challenge our intuitive grasp of reality, suggesting that the fundamental nature of the universe at the quantum level may include phenomena that are essentially unknowable or irreconcilable with classical notions of space and time, underscoring the limits of human cognition in comprehending the true nature of reality.
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Knowledge Questions for Prompt 18
Use these knowledge questions to strengthen the analytical depth of your exhibition commentary.
Are the limits of human cognition the same as the limits of knowledge itself?
Can technology eventually erase what is currently unknowable, or are some limits permanent?
Is private subjective experience genuinely unknowable, or merely difficult to access?
What role does language play in determining what becomes knowable across cultures and time?
Does the vastness of the universe imply that certain truths must remain forever beyond reach?
If something is unknowable, can we still have justified beliefs about it?
How to Score High on Prompt 18
Three strategies our IB examiners use when coaching students through the TOK exhibition.
Choose objects that signal a real epistemic limit
Strong exhibitions on Prompt 18 use objects that visibly point to a boundary — a locked diary, an undeciphered script, the edge of the observable universe. Vague ‘mystery’ objects don’t score; specific limits do.
Distinguish ‘unknown’ from ‘unknowable’
The top markband rewards students who explain why their object is permanently unknowable, not just currently unknown. Be precise about whether the limit is technological, linguistic, cognitive or metaphysical.
Anchor each object to one optional theme
Don’t drift between themes. Each object should clearly link to one optional theme — Technology, Language, or the Knower work especially well for Prompt 18.
TOK Exhibition Prompt 18 — FAQs
What is TOK Exhibition Prompt 18?
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