Important is similar to Historic. Historic is similar to Past. Past is a different concept from Modern. 
Bone is related to Item. Item is a type of Part. Part is related to Door. Door is related to Closed. 
Important <--SimilarTo--> Historic <--SimilarTo--> Past <--DistinctFrom--> Modern 
Bone <--RelatedTo--> Item --IsA--> Part <--RelatedTo--> Door <--RelatedTo--> Closed 