Scarry sees this as an attempt on the humans part to disembody itself. But I see it as an attempt to embody the world- to bring other bodies in the world into a set of relations with the human body. Bodies need these networks of relations to conceptualize themselves. The human project is to construct such relations. Projection can sometimes be an extremely conscious project, but quite often it is simple what bodies do.
Amoebas work out sets of relations with their environment as well.
The difference really lies in the fact that this type of activity on the part of humans becomes conscious to the point that we feel the need to extend the world with artifacts and culture in order to produce more possible reflections. Scarry brings out the relationship between representation and the body. Not only do we use bodies to inscribe the world and bodies to inscribe the world onto, the body is the philosophical ground of our desire to project and receive an identity. It is the continually shifting center of our projection and identity. Not only that, but other bodies influence current relationships and route our body's realignment and reinsciption.