Ceiling is a type of Control. you are likely to find Beam in/at/on Ceiling. Beam is related to Member. Member is a synonym of Link. 
Cover is related to Page. Page is related to Section. 
Control <--IsA-- Ceiling <--AtLocation-- Beam <--RelatedTo--> Member <--Synonym--> Link 
Cover <--RelatedTo--> Page <--RelatedTo--> Section 