How would you describe a Green Lantern to an alien that lives in a dark void and has no concept of light, color, and anything else that vision grants?
Alan Moore and Bill Willingham know how.
“In loudest din or hush profound,
My ears catch evil’s slightest sound.
Let those who toll out evil’s knell,
Beware my power: the F-Sharp Bell!”
All hail Rot Lop Fan the F-Sharp Bell!