Living in small spaces, or even larger spaces with small areas such as this hallway, it is often easy to let space go un- or under-utilized. Allison the Valiant, over at Flickr, has an image of this great skinny bookshelf that makes the most of a small, potentially awkward, space.
Most tower units that we found were under the "bathroom furniture" category in stores online. There seem to be a great variety of these slim shelving systems that are intended for the bathroom, a traditionally tighter space. We love the idea of pulling them out of the bathroom and putting them in some smaller areas of our home that are traditionally skipped over for storage. Here are some of our favorites that we found online: