1) Build or source any suitably large vessel. something with a large width or length will do fine, EG, Tshara's Burning Amber in size will do but anything thats large. Including space stations
2) Place a mirror plane that allows you to be some distance from the chunks where the mirrored change will occur
3) Place down a template or a cube of material and zoom out from the ship. If the point where it is being mirrored to is too far away, then you will see just 1 cube appear.
4) Fly closer to where the other mirrored cube/template should be. There should be significant and noticeable Pop-in of the feature