When a polarization axis of a first polarizing plate is parallel to that of a second polarizing plate, a light emitted from a backlight is transmitted, on the other hand, when a polarization axis of the first polarizing plate is orthogonal with that of the second polarizing plate, a light emitted from the backlight is mostly blocked off. A source is provided of a beam of substantially collimated light characterized by a temporally dependent spectrum. Embodiments of the present invention provide for one or more clients to serve as backup host for the network session. Straps are configured to wrap horizontally across the user and matingly connect to each other. In the position at the normal state, at least one corner portion of the land in the plunger protrudes from an end portion of the corresponding land portion. The visualization system connects the heat map displays to an interface component providing manual or automatic input data from an industrial process or an archive of historical industrial process input data.