I am a movie director and I just received the following movie plot. Could you help me answer this question? If not, let me know by writing "Not answerable". Plot title: Monsters, Inc. Movie plot: The story takes place in Monstropolis, a city populated entirely by monsters. Monstropolis is not part of the human world, but it can be connected to children's bedrooms through their closet doors. When a door is properly activated, it becomes a portal between the monster world and the human world. The city's power supply is provided by Monsters, Inc., a utility company that employs monsters to scare children and extract energy from their screams. The company has a huge warehouse full of doors, work areas called "scare floors" where the doors are activated, and a special training room in which employees practice their scare skills. The company's best scarer is James P. "Sully" Sullivan (Goodman), whose assistant is his best friend, Michael "Mike" Wazowski (Crystal). Sulley's main rival is Randall Boggs (Buscemi), and the company's CEO is Henry J. Waternoose III (Coburn). Monstropolis is in the middle of an energy crisis because children are harder to scare than they used to be.One day, Sully finds an activated door on his scare floor after the workday has ended. He finds no one in the room behind the door, but a little two-year-old girl (Gibbs) follows him back into the monster world. Far from being scared, she calls him "Kitty" and delights in playing with him. Since monsters believe humans are lethally toxic, Sully tries repeatedly to return the girl to her room, but she keeps following him back, and Randall eventually deactivates and stores the door, leaving the girl stuck in the monster world. The girl's presence becomes public knowledge after Sully sneaks her into a restaurant to find Mike, so they hide her in Sully's home while the Child Detection Agency (CDA) searches for her. Sully eventually names the girl "Boo", and he slowly bonds with her after realizing that she is not poisonous. He also discovers that her laughter produces even more energy than her screams.The next morning, Sully and Mike disguise Boo in a monster costume and sneak her into work. Randall agrees to help them return her to her... My question: How do monsters access the human world?
Through the childrens closet doors.