illusion

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Related to Illusions: Optical illusions
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be under no illusion

To know and understand the reality or truth of a situation. Don't worry, I'm not getting back together with Alex. After all his lies, I'm under no illusion about how he operates.
See also: illusion, no

be under the illusion that

To be living, operating, or functioning based on a belief that is fanciful, unrealistic, or untrue. Jeremy's always been under the illusion that he's a great writer, even though he's never written more than a few crummy poems. No one likes paying taxes, but those who would call for them to be done away with altogether are under the illusion that our society can function without them.
See also: illusion, that

labor under the illusion of/that

To live, operate, or function with the unyielding belief in something, especially that which is fanciful, unrealistic, or untrue. Primarily heard in US. Jeremy's always labored under the illusion of being a great writer, even though he's never written more than a few crummy poems. No one likes paying taxes, but those who would call for them to be done away with altogether are laboring under the illusion that our society can function without them!
See also: illusion, labor, of, that

be under the illusion that

wrongly believe that.
1998 Independent The keening harmonies of the Brothers Gibb, a million naff dance routines by medallion men under the illusion that they were John Travolta.
See also: illusion, that

be under no illusion (or illusions)

be fully aware of the true state of affairs.
1992 Christian Scientist Monitor It is crucial to the nation's security…that we be under no illusions about reasons for this zero-loss rate.
See also: illusion, no
References in periodicals archive ?
Lenstore explained: "Optical illusions can confuse the brain and trick you into seeing things differently from reality.
In doing so, "Dangerous Illusions" fearlessly refutes our most careless beliefs, encouraging us to be more aware of the dangers religions pose to our society and, even to change our intellectual practices altogether.
People can take photos using trick-art and optical illusion ndash they can float in the air, crawl out of a crack in the ground, hide in a mouse hole from a cat or sit under the water.It is not about reality but a clever combination of colour, mirrors, angles, shadow perspective and the right position of the photographer.
Visitors do not have a restricted time to enjoy the museum, they are welcome to experience the different illusions and exhibits at their leisure.
"There's growing consensus that optical illusions are not a bug but a feature," said Thomas Serre, an associate professor of cognitive, linguistic and psychological sciences at Brown and the paper's senior author.
Open as part of an international museum chain that first debuted in the Croatian capital of Zagreb in 2015, the Dubai edition of the Museum of Illusions is the biggest one to date with over 80 interactive exhibits designed to challenge the minds of people of all ages, organisers said.
Located in a corner of the old buildings down Dubai Creek's Al Seef, the Museum of illusions opened to the public on Sunday bringing over 80 optical and sensory illusions that combine fun elements with educational experiences.
Set to open in the Al Seef development near the Dubai Creek, the museum will boast of the largest collection of optical illusions in the Museum of Illusions' worldwide portfolio and will house 80 exhibits of all shapes and sizes, said a report in Khaleej Times.
The sheer click numbers of British Youtube sensation Howard Lee show how much people are fascinated by visual illusions. He regularly uploads videos showing objects he rendered so realistically that it's hard to distinguish the drawings from the real thing.
Optical illusions are one of those topics that are always popular, appealing to a wide range of readers of all ages, and this book would be a good addition to the school library shelves.
Fresh from its record-breaking success in London's West End, IMPOSSIBLE has been hailed by critics as 'the Hottest Act in Town' (Daily Mail) for giving 'variety, illusion and magic a brilliant, fresh spin' (The Stage).
In conjunction with the country's celebrations of the 47th National Day, the Museum of Illusions has officially opened its doors at Muscat Grand Mall (MGM), a press release said.
by Times News Service The Museum of Illusions was formally inaugurated at the Muscat Grand Mall on Monday.
In conjunction with the sultanate's celebrations of the 47th National Day, 'Museum of Illusions' has officially opened its doors at Muscat Grand Mall (MGM).