you are likely to find Lawyer in/at/on Desk. you are likely to find Lunch in/at/on Desk. Lunch is related to Morning. 
Presence is a type of Impression. Presence is related to State. 
Lawyer --AtLocation--> Desk <--AtLocation-- Lunch <--RelatedTo--> Morning 
Impression <--IsA-- Presence <--RelatedTo--> State 