What’s the difference between an illusion and a delusion. In this post in my series of Troublesome Pairs, I’ll explain it to you …
An illusion is a false or deceptive appearance, impression or perception: “He gave the illusion of being able to touch-type: in fact, he stared at the keyboard and typed with two fingers”; “The illusion produced by the smoke and mirrors was very convincing and she thought that she could see the magician in two places at the same time.”
A delusion is an internally produced belief that is not in line with what is generally accepted to be the truth: “He fell prey to the delusion that he was a magnet for women, but put them off with his cheesy chat-up lines”.
You can think of it like this: an illusion is imposed from the outside, while a delusion arises from the inside. I hope that helps!
You can find more troublesome pairs here and the index to them all so far is here.