Surround is related to Room. Room is related to Gym. Gym is related to Building. 
Contrast is a type of Differ. Differ is derived from Difference. Difference is a type of Quality. Nature is a type of Quality. 
Surround <--RelatedTo--> Room <--RelatedTo--> Gym <--RelatedTo--> Building 
Contrast --IsA--> Differ --DerivedFrom--> Difference --IsA--> Quality <--IsA-- Nature 