It's very effective with such a simple subject matter, and lends a lot of drama to what could be just photos of cold metal hardware.
I like the one where the nail sees its (her?) shadow as a ballerina. It addresses a universal theme - that we all see ourselves differently than others see us.
I also like the one where the father nail is listening to his pregnant nail wife's stomach. Very clever.
It's amazing how the photographer can tell such stories so simply.