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Knowledge and testing

Illusion

Misleading appearance

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Extended note

Illusion shows why appearance cannot automatically be made into knowledge. Illusion does not abolish actuality; it shows that appearance must be tested, corrected, and traced against what is.

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Limitations

Not the same as

  • actuality
  • lie
  • fantasy alone
  • all sensory experience
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Related terms

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Methodological relevance

When material may be illusory or misleading, the audit must distinguish what actually appeared, how it was interpreted, and what later control shows.

Sources and principal occurrence

Source note: T3 and Corrigible Realism use illusion as a reason for correction, not as a reason to reject actuality.

  1. T3 — Appearance and ObservationThe sustained theory document on appearance, registration, observation, interpretation, and inference.
  2. Corrigible RealismThe academic and philosophical position.
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Correct and incorrect use

Correct use

“The image suggested proximity, but perspective produced an illusion.”

Incorrect or over-strong use

“Because illusions exist, we never reach actuality.”

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Suggested citation

Suggested citationVikesland, M. A. A. (2026). “Illusion”. Røyndalism — Lexicon, content version 1.0.

APAVikesland, M. A. A. (2026). Illusion (version 1.0). Røyndalism. https://royndalisme.no/en/lexicon/illusion/

MLAVikesland, Martin A. A.. “Illusion.” Røyndalism, version 1.0, Vikesland Press, 2026, https://royndalisme.no/en/lexicon/illusion/.

ChicagoVikesland, Martin A. A.. “Illusion.” Røyndalism. version 1.0. Vikesland Press, 2026. https://royndalisme.no/en/lexicon/illusion/.

IEEEM. A. A. Vikesland, “Illusion,” Røyndalism, version 1.0, Vikesland Press, 2026. [Online]. Available: https://royndalisme.no/en/lexicon/illusion/

CSEVikesland MAA. 2026. Illusion. version 1.0. Røyndalism. Vikesland Press. Available from: https://royndalisme.no/en/lexicon/illusion/

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Revision note

Document version
1.0
First published
18 June 2026
1.0

First public edition.