Allusion vs Illusion

These 9 sentences help you tell an allusion from an illusion. An allusion is an indirect reference to something, often a book or a story, while an illusion is a false impression or something that is not really there. You pick the right word for prompts like "The teachers use ___s in instruction to tap our background knowledge" and "Add mirrors to the room to give the ___ of lots of space." Recommended level: intermediate. A point the questions make nicely: an allusion points outward to another idea, while an illusion only fools the eye or the mind.