Some things to consider when evaluating bookshelves are * shelf adjustability (Some bookshelves allow you to raise and lower individual shelves, adjusting the distance between them, and the height of books or items that can be placed on them.) * protection of the books (from dampness, humidity) * appearance * accessibility and visibility of the books * other uses (bookshelves can also be used as displace cases or for other storage) * materials: wood, metal, glass, plastic * tilt -- some bookshelves are tilted to make access easier, especially the lower ones * doors * number of shelves * weight the bookshelves can support * is the base adjustable for slightly uneven floors or is there a wall anchor - anti-tilt features * freestanding, attached t