What can be done to a rough textured wall?

All of my homes walls are rough textured (350 ' condo) all the rage in 1984. One piece of the wall of about 8' by 3' faces a piece of wall, the same size, but covered in a mirror. I thought the mirror would brighten the room but - it just gives an image of the blank wall across the room. What can I do to my rough textured wall that could be then reflected in the mirror?

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