Mechanic is related to Person. Observer is a type of Person. Observer is part of Observation. Observation is a synonym of Notice. 
Farm is related to Outside. Outside is related to Deck. 
Mechanic <--RelatedTo--> Person <--IsA-- Observer --PartOf--> Observation <--Synonym--> Notice 
Farm <--RelatedTo--> Outside <--RelatedTo--> Deck 