Answer:
What can be seen but not touched?
It's what light turns into in the night
My second is performed by my first, and it is thought a thief by the marks of my whole might be caught.
This became a fashion statement in the garden of Eden.
This is the main ingredient in spaghetti and Mac-ยญN-ยญCheese.
All about, but cannot be seen, Can be captured, cannot be held, No throat, but can be heard. Who am I?