Theme is a type of Film. Theme is etymologically related to Do. Do is related to Writing. Writing is related to Line. 
you are likely to find Deck in/at/on Backyard. Deck is related to Floor. 
Film <--IsA-- Theme --EtymologicallyRelatedTo--> Do <--RelatedTo--> Writing <--RelatedTo--> Line 
Backyard <--AtLocation-- Deck <--RelatedTo--> Floor 