I have read this answer from John Rennie.
Where he says that to a Schwarzschild observer, anything reaching the event horizon will seem to be frozen there forever.
Now if we send mirrors from all angles towards the black hole so that they reach the event horizon horizontally (perpendicular to the center of the black hole) with their reflective side outwards, then we can practically wrap the black hole in mirror gift-wrapping.
If these mirrors will seem to be frozen at the event horizon forever in fact, then they will reflect light.
This is where I am getting confused. If the mirrors are visible to an outside observer, then do they see their own actions in the mirror, or do they see an image from the past in the mirror (from the past moment when the mirror reached the horizon)?
This is a contradiction, because if they see a frozen image, then that image needs to be made of photons that are reflected by the mirror only once when the mirror reached the horizon. How can these photons keep being reflected for all time? That needs more and more photons coming from the horizon from the mirror surface. If the image is frozen, then the new photons cannot be ones reflected from our present (outside). Because in that case, the image would change with us. If the image is frozen, it must be made of photons from the past. Now those photons reflect our past once, understandable. But how can photons keep coming from the mirror with the same image? Those new photons with the same image must be reflected from somewhere originally? The mirror cannot keep producing new and new amounts of photons to create the same image? The mirror will either reflect those photons or will receive and reflect new photons from outside and keep reflecting them with new images.
If they see an interactive, not frozen image, then it is a contradiction too, because the interactive image means photons are being reflected all the time from the mirror, making our present life visible in an interactive way. This needs the mirror to be actually there physically frozen (from an outside observer's view). In this case, the mirror receives photons from outside and reflects them back, but to do that, the mirror must physically be there (in the observer's frame).
The only logical solution might be, that the mirror viewed from the outside observer's frame is physically there frozen at the horizon. In that case, the mirror will reflect an interactive, not frozen image.
Will they see their present being reflected from the mirrors interactively going on?
Or will they see their image frozen from the past (moment in past when the mirror reached the horizon)?