Wooden Beam

Wooden Beams are decorative furniture items. They are found in Abandoned mine shafts with Planked Walls. Despite looking like background Walls, they share a layer with other furniture items, like Tables and Torches, and thus cannot be placed "behind" them. Wooden beams provide support for torches, but not other wooden beams, making them functionally identical to Trees (except not dropping Wood or Acorns).

They can be placed adjacent to doors, making them one-way only, which is useful for keeping out Zombies during Blood Moons. Keep in mind that the doors themselves can still be broken down by some enemies, perhaps once hardmode has been triggered.