Letters on a white page are defined by the shape of the letters. They are also defined by the white surrounding the letters. Similarly, Smriti defines the Pureshea aspects of Vedic Knowledge. So it is reasonable to call all things Pureshea (Vedangas for example) Smriti. Or is it? Is the white background the letters? Or are the letters the letters?
The structure of the Veda is like a crystal. It is like a house of mirrors. Everything is seen in everything else. Does the reflection carry the meaning? Is the reflection more the mirror than the mirror is? Of course, we must not take the analogy of the mirror too far. However, it does, I believe give a feeling for the structure of existence. All aspects of existence are mirror images of one and other. Existence can be viewed as a magnificent crystal.
Smriti is fascinating.