A housing includes a substrate, a transition layer disposed on the substrate, and a color layer disposed on the transition layer. The present invention also relates to laundry detergent compositions in liquid or gel form comprising ESS. Each sub-storage unit includes a plurality of hard disk drives, a plurality of enclosures, and a plurality of power supply devices. CVD silicon nitride is applied over the sacrificial layer and enters the array of holes to produce closely spaced pillars. The method includes receiving one or more images included in a predefined area; receiving one or more parameters associated with the image; and integrating the images and parameters into a map of the predefined area to enable mapping the visual path through the predefined area in response to one or more input path parameters.