you are likely to find World in/at/on Space. you are likely to find Country in/at/on World. Country is related to Entity. 
you are likely to find Sign in/at/on Town. you are likely to find Flat in/at/on Town. Flat is a synonym of Level. 
Space <--AtLocation-- World <--AtLocation-- Country <--RelatedTo--> Entity 
Sign --AtLocation--> Town <--AtLocation-- Flat <--Synonym--> Level 