Less clear is to what extent, and under what circumstances, users of our system have a good sense of the virtual object’s presence at the correct distance and size. While the first user experiment demonstrates that users are able to perform much better than chance on determining object size and distance in a controlled setting, subjects clearly performed worse at this task than if real objects were presented. Stereo projection would likely enhance the correct perception of size and distance (as in [3]). However, today’s stereo projection technologies generally require wearing glasses, obstructing the face and impinging on the fluidity of face to fact interaction.