Portability - a set of dumbbells takes up very little room; even compared to a simple barbell, you can store dumbbells under the bed or on the bottom of a bookshelf so that they are both readily available and also out of the way.
If you're in a hurry but the idea of a custom bookshelf appeals to you, there are kits available that will let you indulge in a little creative construction without all the hassle of cutting and choosing the hardware yourself.
Classic Bookshelf attempts to make online book reading a more comfortable experience by allowing you to customize the font size, screen color, and background appearance of the page to fit your own unique preferences.
Whether you're mounting a bookshelf on a desk, wall or creating a floor-standing model, your major concerns should be to choose a structure that will handle the weight while keeping the piece level, square and true.
Build a bookshelf that will either be flexible enough to service another room or area in the same room, or be so utilitarian, or well integrated, that keeping it where it is won't become a problem.