A tall modular bookcase that stacks vertically maximises floor space and draws the eye upward which works brilliantly in rooms with higher ceilings. Stacking means you add height as your collection grows. The taller you go the more stability matters so the base needs to be robust. Tall stacking units can dominate a corner or wall which is actually useful if you want them to be a focal point. The height means you need a step or ladder for upper shelves which is worth factoring in. These are the modular bookcases that stack vertically and make proper use of wall height when floor space is precious.