Illusion Magick is about covering hidden moves with larger ones.
They can be gestures, words or combinations of such.
Allusions can hint something or distract from something that mage or his friend is doing, so observer has no idea how it's done.
Sometimes few words have so many hidden meanings that you can only smile and relax without understanding how they work, how much work of how many people is involved.
You can be suprised what you can see on the stage, and how it can help someone understand cause and effect, to help them.