Way is a type of Category. Category is related to Clock. you are likely to find Clock in/at/on Desk. you are likely to find Envelope in/at/on Desk. 
you are likely to find Project in/at/on Shelf. 
Way --IsA--> Category <--RelatedTo--> Clock --AtLocation--> Desk <--AtLocation-- Envelope 
Shelf <--AtLocation-- Project 