Allusion vs Illusion
Due to the subtitle of this blog I get a number of people who appear to be searching for the difference between the words illusion and allusion washing up on the shores of my web pages. I suspect they flail about a bit and flee, whatever they gained from their visit it was not the answer to the question that they asked. This post is to correct that sad situation.
In definition the words aren’t too similar. An illusion is an erroneous mental representation. In a literary sense it is something that is false that appears, or people believe to be, true. “He had the illusion of faith” for example. It is a disjunction between perceived reality and objective reality.
Magic tricks are often called illusions as they hinge on the audience perceiving something different from what is really happening. Optical illusions trick the senses so that the brain perceives something different than what is real.
An allusion on the other hand is a reference within a work, usually literary or artistic, to an external work, person, character, etc. with the assumption that the audience will be familiar with the reference. The reference can be either direct or more veiled. “This task makes me feel like Sisyphus.“, would be a direct allusion to the fact that every time the task is almost done it encounters a setback.
A homage or “nod of the head” to earlier actors or directors in cinema is a form of allusion. My favorite hidden allusion was a soap opera I once saw that had a plane with the id numbers NCC-1701, the registration of the Enterprise in Star Trek. The reference to Star Trek would be an allusion, one that was lost on the people who were watching the soap opera, versus me, who was trying to take a nap in the college lounge.
So as I suggested earlier, with the exception of spelling and pronunciation, the two words aren’t that similar. In Summary:
Illusion: Cutting your assistant in half, balanced budget, your computer is secure, privacy, etc.
Allusion: Catch-22 (Joseph Heller novel), 15 minutes of fame (Andy Warhol quote), Romeo (Shakespeare character), David and Goliath (Bible story), billions and billions (Carl Sagan) more.