Tourist is a type of Traveler. Tourist is related to Person. Person is related to Statue. Statue is related to Exhibition. 
Watch is related to Measure. Measure is related to Math. Math is related to Proof. Demonstration is a type of Proof. 
Traveler <--IsA-- Tourist <--RelatedTo--> Person <--RelatedTo--> Statue <--RelatedTo--> Exhibition 
Watch <--RelatedTo--> Measure <--RelatedTo--> Math <--RelatedTo--> Proof <--IsA-- Demonstration 