We see objects in the world cannot see ourselves seeing, anymore than we can jump over her own shadow.

 The subject that sees objects in the world cannot see itself seeing,
 any more than a person can jump over her own shadow. 

To the extent that a subject can reflectively see itself, it sees itself not as a subject but as one more represented object, what Kant calls the “empirical self” or what Žižek calls the “self” (versus the subject) 

The subject knows that it is something, but it does not and can never know what Thing it is “in the Real”, as he puts it This is why it must seek clues to its identity in its social and political life, asking the question of others (and of the big Other (culture), which defines the subject.