Detroit is a small mod that will increase the versatility of frames in Minecraft, since this mod allows us to place frames at the bottom and top of any block in the game. This means that with this mod we can place frames n anywhere in a block.
As you may know, by default, wooden frames can only be placed on walls, i.e. on the vertical faces of almost all blocks in the game. However, they cannot be placed neither on the floor nor on the ceiling. Instead, after installing this mod, we can place wooden frames on the ceiling and on the floor.