Instrument is related to Paper. Paper is related to Cash. Cash is a type of Exchange. Exchange is a type of Transaction. 
Robot is a type of Worker. Artist is a type of Worker. Artist is related to Museum. 
Instrument <--RelatedTo--> Paper <--RelatedTo--> Cash --IsA--> Exchange --IsA--> Transaction 
Robot --IsA--> Worker <--IsA-- Artist <--RelatedTo--> Museum 