I think it would be interesting to creat a “mirror” which deducted by computer the person looking in to it.
My intent would not be to suggest that person does not exist, but rather that the world is a much more interesting place when we don’t make ourselves the centerpiece.
Additional ideas: highly interesting or even interactive background behind the viewer, or taking their picture and adding it back in reduced and marginalized, but fully mirroring their motions. I think this is technically possible.