If you look very carefully, you see that his skull has been replaced with a transparent Plexiglas dome so that the workings of his brain can be observed and also controlled with light.
Om ni tittar noggrant, ser ni att hans övre kranium har ersatts med en en genomskinlig plexiglas-kupa så att de inre mekanismerna i hjärnan kan observeras, och även kontrolleras, med ljus.