Answer:
Open me, and you can't see me without a mirror. Close me and you can't see me at all. What am I?
I have an eye but I cannot see. What am I?
I am a bow that can never be tied or broken but can disappear. What am I?
No matter how hard you hit me, no matter how much I hurt, I'll always go for a laugh. What am I?
The more you take away from me the bigger I shall get.
I flow from the Homerβs mouth when he sees doughnuts.