Some embodiments of the present invention employ a modular room including a plurality of modular room components (e.g., anchor assemblies, upright assemblies, etc.). These anchor assemblies and upright assemblies can take different forms permitting assembly of a modular room or modular structure in different manners, and in some cases provide for interchangeable interior and exterior wall panels and components. In some embodiments, a bracket assembly is coupled to an substantially vertical elongated upright for improved strength and stability. Preferably, the anchor assembly has a base plate with at least one edge at an angle with respect to the rest of the base plate for additional strength. If desired, the vertical position of the upright with respect to the base plate can be adjusted. In some embodiments, one or more overhead trusses are used to stabilize the walls of a modular room.

A lumbar support to be installed in a seat has an apex that varies vertically along a guide rail. The guide rail has an upper stop and a lower stop. A bowing element disposed on the guide rail travels in a substantially vertical plane. A first bowden cable draws an upper of the bowing element downward until a lower portion of the bowing element is in abutment with the lower stop such that a low convexity is formed in the bowing element as the bowden cable continues to draw the upper portion of said bowing element further towards the lower stop. A second bowden cable draws a lower portion of the bowing element upward until the upper portion of the bowing element is in abutment with the upper stop and such that a high convexity is formed in the bowing element as the bowing element continues to draw said lower portion of the bowing element further towards the upper stop.