Freedom is a type of Illusion. Freedom is the opposite of Constraint. 
you are likely to find Door in/at/on Bus. Door is related to Hallway. Hallway is a type of Room. Room is related to School. 
Illusion <--IsA-- Freedom <--Antonym--> Constraint 
Bus <--AtLocation-- Door <--RelatedTo--> Hallway --IsA--> Room <--RelatedTo--> School 