Incredibly, common warehousing systems utilize only about 40% of the total available space for storage of materials or goods, the rest is allotted for passageways. Stacking up the cartons, bags or crates of the materials in their maximum heights does not improve much the wastage of space. This may be acceptable when there is less materials to store, but when space is at a premium, solutions have been usually found in pallet racking or building storage mezzanines. Like the concept of high-rises that use up little ground space but a great deal of it upwards, vertical storage has been an adequate solution, at least until recently.

Movable storage. The twin dominant difficulties of storage management have always been storage space and materials access. Vertical storage utilizes the available space above ground level, mostly vacant in most conventional warehousing ways. Nonetheless, there is still the largely unused 'road system' for getting to and retrieving materials, the passageways. The warehouse forklift could only use its own space at any one time, so that the aisle spaces it is not using is wasted.

The mobile storage system moves the shelving closer if the aisle between them is not being utilized so that the space is not wasted. The appropriate racks are then pushed apart when needed to allow the forklift entry to the materials. In this method the space between racks or shelves are used, granting as much as 100% additional storage space. The racks or shelves are moved either manually or with machine assistance.

Upright carousels. Similar in concept to the restaurant dumbwaiter or the Rolodex, vertical carousels create storage space by eliminating the need for mechanical carriers like a forklift. Because the materials are placed in bins, racks or shelves accessed by humans, the aisle space between the carousels may be lessened, opening up additional space for storage. One advantage of this system is that the materials are each time accessed at the identical height level, which can be a boon for the accessing persons. On the other hand, vertical carousels are usually used for small-sized materials.

Automated self-storage. This system is run by computer and does away with the need for personal intervention, at least nearly all of the time. While the materials are placed in uniform-sized containers and stowed in racks and pallets, loading and retrieval is done by an automated loading-retrieval forklift-like contraption that brings the appropriate module to the person at the retrieval window. The same machine receives the containers from the loading door for storage. So actually the machine is the storage helper with the human as the supervisor.

As room gets scarcer for storing materials in a manufacturing or selling business, the search for solutions goes on at an ever accelerating rate. The first significant solution course of vertical storage has been followed by mobile storage, both lateral and perpendicular, apparently exhausting the alternatives so that as yet no new directions are readily foreseen. But, the search has not stopped and no doubt we will know more newfangled] solutions in the future, minimizing the materials themselves.

A fence is akin to a picture frame: it limits but enriches the looks of a property. A formal garden less a fence will seem like an aberration in a meadow; or, worse, a misplaced declaration of a desirable life. A fence can restrict a vista, correct, but it can also create a world in its confines. Perchance a restricts world, but a private one created to your definitions and desires.

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