They know what goes into creating a sustained stage illusion, and how to make a scene partner give and then give some more.
Hodges is under no illusion how difficult it will be to continue his club's rapid rise up the football pyramid.
"We are under no illusions how we need to be to stay in the team under the new manager," Sadler told BBC Sussex.
And once the Virgin's face or George Washington's profile are spotted, it's virtually impossible to unsee them, says Bruce Hood, author of The Self Illusion: How the Social Brain Creates Identity.
The works, fittingly for this white-walled space, are all about the play of illusion, how weighty materials can look light as air against these walls, and can be yoked together to create strange conjunctions.
"I have been at this football club for 10 years and I know what Swansea City means to everyone in the community - and beyond," said Monk. "I am under no illusion how much hard work is needed going forward.
"We're under no illusion how difficult the task is".
Optical illusion: how cleverly the war begins in his '93 Mazda MPV.
"We were under no illusion how hard it would be".
Intuitively, this evidence should extinguish the illusion: how, after all, can the experience that a foreign rubber arm is the one that is being touched be correct if the arm is not in fact seen to be physically touched?
