Ceiling can Metaphor. you are likely to find Ceiling in/at/on Classroom. you are likely to find Book in/at/on Classroom. 
Represent is related to Portray. Portray is related to Emphasis. 
Metaphor <--CapableOf-- Ceiling --AtLocation--> Classroom <--AtLocation-- Book 
Represent <--RelatedTo--> Portray <--RelatedTo--> Emphasis 