What's key about communicating is the formation of meaning. And that doesn't happen on the page. It happens in the mind of the reader. That's who you have to care about, and that's where you do your work as a writer.
There is so much in ourselves and in others that we must take on faith. Memories, hopes, illusions, these are all bound up in perception. Nabokov shows us that what is "real" is partially made, partially known, and partially a blessed mystery.