Used and loved by millions
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com
illusion observed
Grammar usage guide and real-world examplesUSAGE SUMMARY
The phrase "illusion observed" is correct and usable in written English.
It can be used in contexts discussing perceptions, experiences, or phenomena that are not as they seem, often in philosophical or artistic discussions. Example: "The artist's work challenges the viewer to confront the illusion observed in the interplay of light and shadow."
✓ Grammatically correct
Science
News & Media
Alternative expressions(1)
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Human-verified examples from authoritative sources
Exact Expressions
2 human-written examples
Contraction bias in delayed comparison tasks is a common cognitive illusion observed in many different modalities and under different experimental conditions [1] [8].
Science
The induced twinkle after-effect (TwAE), first described by Ramachandran and Gregory in 1991, is a compelling illusion observed in normally sighted subjects who are deprived of visual input to a restricted area of retina using an artificial scotoma [1], [2].
Science
Human-verified similar examples from authoritative sources
Similar Expressions
58 human-written examples
Although this slight asymmetry in mass distribution is unrelated to this study, it is important to briefly mention as it resulted in an independent low-level illusion (also observed in pilot data: Jellema et al., 2004).
Science
Especially, holographic method is particularly regarded as one of the most attractive approaches for creating the most authentic illusion of observing volumetric objects.
However, if these ware the cases, the motion illusion should be observed at retinal positions that had not been exposed to apparent motion with tones.
Science
In "Lost Illusions," Balzac observes that it was standard practice in Paris to bribe editors and critics with cash and lavish dinners to secure review space, while the city was plastered with loud posters advertising new releases.
News & Media
This model also allows us to make predictions that can be tested through psychophysical experimentation as separate motion illusions that are observed by humans in experiments [8].
If the low-frequency boosting is not the explanation for the Craik-O'Brien-Cornsweet illusion, why it was observed in [11]?
Science
Thus, prior to the present investigation, non-speech audio-visual illusions have only been observed in a spatiotemporal task where audition biases vision.
Science
In this illusion, the participant observes a rubber hand being touched in synchrony with touches applied to his or her real hand, which is hidden out of view.
Science
Though the consecutive stabs may sporadically shift from one region to another giving an illusion of movement, clinical radiation observed in EF is definitely not typical for PSH [1].
Expert writing Tips
Best practice
When discussing the fallibility of perception, use "illusion observed" to subtly suggest a critical evaluation of what seems apparent.
Common error
Avoid using "illusion observed" in very informal settings; it often implies a level of analytical distance that might sound stilted in everyday conversation. For casual speech, consider simpler terms like "trick" or "something that isn't real".
Source & Trust
84%
Authority and reliability
4.3/5
Expert rating
Real-world application tested
Linguistic Context
The phrase "illusion observed" functions primarily as a noun phrase followed by a verb, acting as a subject complement or part of a more complex description. According to Ludwig AI, the phrase is correct and usable in written English.
Frequent in
Science
50%
News & Media
33%
Formal & Business
17%
Less common in
Encyclopedias
0%
Wiki
0%
Reference
0%
Ludwig's WRAP-UP
The phrase "illusion observed" is a grammatically sound construction used to describe a deceptive perception or appearance that has been noticed. As Ludwig AI confirms, it is correct and usable. Predominantly found in scientific and analytical contexts, the phrase carries a neutral to formal tone, indicating a critical and detached observation. While versatile, its use is best suited for discussions requiring precision and analytical depth, avoiding overly casual or informal settings. Related phrases include "perception noted" and "phenomenon witnessed", each offering slightly different nuances. Top sources include PlosOne and The New York Times.
More alternative expressions(6)
Phrases that express similar concepts, ordered by semantic similarity:
perception noted
Replaces "illusion" with "perception", highlighting the act of perceiving something, and "observed" with "noted", indicating a simple recording of the perception.
appearance perceived
Replaces "illusion" with "appearance", focusing on how something looks, and "observed" with "perceived", highlighting subjective sensory experience.
phenomenon witnessed
Substitutes "illusion" with "phenomenon" which refers to something observed, and "observed" with "witnessed", suggesting a direct experience of the event.
optical trick noted
Replaces "illusion" with "optical trick", highlighting the deceptive nature related to sight, and "observed" with "noted", for simple recording.
misconception identified
Replaces "illusion" with "misconception", stressing a mistaken belief, and "observed" with "identified", indicating the act of pinpointing this belief.
pattern detected
Replaces "illusion" with "pattern", implying a structured observation, and "observed" with "detected", indicating discovery through analysis.
cognitive bias seen
Substitutes "illusion" with "cognitive bias", pinpointing a systematic error in thinking, and "observed" with "seen", referring to visibility or awareness.
anomaly identified
Uses "anomaly" instead of "illusion", indicating a deviation from the norm, and "identified" instead of "observed", emphasizing recognition of the anomaly.
deception recognized
Replaces "illusion" with "deception", focusing on misleading appearance, and "observed" with "recognized", indicating the illusion's deceptive nature has been understood.
fallacy detected
Uses "fallacy" in place of "illusion", indicating a flawed or misleading idea, and "detected" emphasizing the finding of the fallacy.
FAQs
How can I use "illusion observed" in a sentence?
You can use "illusion observed" when discussing a deceptive appearance or perception, like "The magician masterfully created an illusion observed by the entire audience".
What are some alternatives to "illusion observed"?
Alternatives include "perception noted", "phenomenon witnessed", or "appearance perceived", depending on the specific nuance you wish to convey.
Is "illusion observed" the same as "observed illusion"?
While similar, "illusion observed" emphasizes the act of observing the illusion, whereas "observed illusion" highlights the illusion itself as being something that has been observed. The best option depends on which aspect you want to emphasize.
In what contexts is "illusion observed" most appropriate?
"Illusion observed" is suitable in academic, scientific, or analytical contexts where a deceptive perception or appearance is being critically examined.
Editing plus AI, all in one place.
Stop switching between tools. Your AI writing partner for everything—polishing proposals, crafting emails, finding the right tone.
Table of contents
Usage summary
Human-verified examples
Expert writing tips
Linguistic context
Ludwig's wrap-up
Alternative expressions
FAQs
Source & Trust
84%
Authority and reliability
4.3/5
Expert rating
Real-world application tested