Image 7 - Depth

In this image depth is through a couple of different methods.  The first is interposition. The viewer can tell that the chair is in front of the other objects because of it's position to overlap the other items.  This places the chair in the absolute foreground, with the items on the counter being behind it, and the garage door being behind all of the items, making it the background. 

Size plays a factor in this as well, along with space.  The size of the chairs back as compared to a mortar and pestle or a plastic bin is what it would be if they were placed together.  We can't even tell how large this chair is, we are only seeing a part of it but it still the largest single item in this picture and grossly out of proportion at that. That is also how it's space in the frame is creating depth, taking up quite a lot of it and still not having room to see the whole object makes the other objects seem smaller and further away.

Focus in this picture is also creating a sense of depth.  The most in focus item is nearest the forefront, just like you would see with your eyes, and the things further back in the field are harder to see.