Color is a type of Change. Color is related to Brown. Brown is related to Sack. 
Hill is related to Grade. Grade is the opposite of Test. Test is related to Experiment. Observer is part of Experiment. 
Change <--IsA-- Color <--RelatedTo--> Brown <--RelatedTo--> Sack 
Hill <--RelatedTo--> Grade <--Antonym--> Test <--RelatedTo--> Experiment <--PartOf-- Observer 