The supports are long steel bars that go through the shelves and into the studs in the wall. We predrilled holes for them before we tiled. We used oak planks seamed together to make a solid wood shelf." I love the hanging coffee mugs.
Wall mounted corner shelf: I like the design and how it attracts the eye, but I picture this made with reclaimed pallet wood doubling or even tripling up planks that would give it more depth and character.