www.ssgindustrial.com is a great site to see more of these concepts.
Industrial High Density Mobile Storage Shelving is built for heavy duty warehouse, distribution, manufacturing, and other industrial applications (view industrial high density shelving image gallery). High Density mobile shelving reduces your storage floor space to one-half the floor space required by traditional stationary storage shelving!
Cut Your Floor space in Half with High Density Industrial Shelving
Do you know how much floor space are you really wasting? Based on years of surveying storage facilities, our experience shows that most storage facilities waste over half of their storage areas with unnecessary aisles. High Density mobile shelving takes multiple traditional aisles and replaces them with one or more movable aisles based on your activity level.