you live in a cube, when ever something leaves the cube, another thing will come to take its place from a different side of the cube.

most of our cubes are too big for us to notice.

for example, sometimes the only thing which leaves the cube is a single thought you think.

but... that thought doesnt just go somewhere and die, no it has an impact on the realm of thoughts.
and in that realm there may be a signle thought even a meaningless thought of some one very real somewhere on earth, who happens not to agree with your thought.

BOOOM NUKE EXPLOSION VIOLENCE, but dont worry its just imagination land.

but things like birds are really scared of those booms etc, so they chirp, and the one bird which was somehow impacted by the war of thoughts in imagination land, is now outside your window chirping your thought back into your cube... annoying you a little bit cause you are trying to enjoy coffee.