Answer:
The last man on Earth received a phone call, who was the caller?
I'm the source of all emotion but I'm caged in a white prison.
I have cities without people forests without trees and oceans without water. What am I?
What breaks when you say its name?
I can be any color you can imagine. You see me in everyday life. Look around, you can probably see some of me right now. What am I?
I will disappear every time you say my name.