New answers tagged studs
The safest approach is to actually cut the wall open and see what you are really dealing with. While it involves drywall repair and paint, it also doesn't involve heavy fragile expensive items being hung based on conjecture. While the wall could be brick, it could also be studs (steel or wood) with resilient channel (somewhat age of building and local ...
It might be a brick/masonry wall, that uses furring strips to attach the drywall to the masonry. From the image, it looks like the furring runs horizontal along the wall.
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