This is an office
What is this demonstrating?
this is demonstrating that there is a part to a whole relationship with the file cabinet the objects in the file cabinet constitute its contents (constitute to object is a bit different, a more specific than part to a whole). specifically, figuring out how they got a nail file in the file cabinet, who knows?
┌─────────────┐ │ ─── │ │ │ │ │ │ │ ┼─────────────┼ │ ─── │ │ │ │ │ │ │ ┼─────────────┼ │ ─── │ │ │ │ │ │ │ └─────────────┘