Ceiling is a different concept from Floor. Floor is a type of Control. Govern is a type of Control. Govern is a synonym of Regulate. 
Ordinary is related to Person. Person does not want (to) Tragedy. 
Ceiling <--DistinctFrom--> Floor --IsA--> Control <--IsA-- Govern <--Synonym--> Regulate 
Ordinary <--RelatedTo--> Person --NotDesires--> Tragedy 