M  I  R  R  O  R  S

Mirror, Mirror, on the wall.

     Create a box with the mirror 1 texture from the common textures group. Now create a misc/ misc_portal_surface entity that is less than 64 units away from the mirror, (if it is too far away you might get nasty affects) by right clicking on the map and selecting misc_portal_surface from the misc category. Make sure that you cover all the sides of the mirror except the surface side. (basically just make a frame that covers 5 sides). And that is how you make mirrors.