Psychologists can use these projections to see a person's hidden personality and their internal life. These tests often incorporate images of journeys, forests, the home and mirrors because they are easy for people to associate with their lives, their selves and their desires.
例如，心理測驗中最常用旅程、森林、房子、鏡子等物件，即因它們容易令人關聯到人生、自我、希望等類情境。