Tale is related to Story. Story is related to Creation. Creation is related to Structure. Structure is related to Bridge. 
Bad is related to Depression. Depression is related to Blue. Blue is a different concept from Purple. 
Tale <--RelatedTo--> Story <--RelatedTo--> Creation <--RelatedTo--> Structure <--RelatedTo--> Bridge 
Bad <--RelatedTo--> Depression <--RelatedTo--> Blue <--DistinctFrom--> Purple 