made a lumbber rack recently and used some galvanized welded mesh instead
of solid wood for the shelf for few reasons

makes it easy to see from underneath what is on the bottom

easy to keep it clean and keeps it all drier


may try this with a bookshelf but instead will probably go with some
stainless mesh

it gives it a modern look and is also easier to keep clean

the mesh can be expensive depending on what you get but it looks good


anyone tried using a mesh instead of wood for shelves