Shelf is etymologically related to Carve. you are likely to find Picture in/at/on Shelf. Picture is a type of Representation. 
Working is related to Farmer. Farmer is related to Song. Song is the opposite of Talk. Talk is a different concept from Silence. 
Carve <--EtymologicallyRelatedTo-- Shelf <--AtLocation-- Picture --IsA--> Representation 
Working <--RelatedTo--> Farmer <--RelatedTo--> Song <--Antonym--> Talk <--DistinctFrom--> Silence 