Structural coupling and cognition: A history of these and other notions in the biology of cognition

A liquid crystal cell comprises a transparent top support plate having a transparent conductive coating thereon, a bottom support plate smaller than the first support plate and having a reflective conductive coating on one surface thereof and a black coating on its opposite surface is centered with respect to and spaced from the top support plate, a layer of a liquid crystal composition fills the space between the support plates, a metal cover encloses the bottom support plate and liquid crystal layer and is sealed around its periphery to the top support plate by means of a metal frit and solder. The cover is insulated from the top support plate by means of a dielectric insulating layer on the support plate. Spring means are provided which are bonded to the cover and the bottom support plate for holding the bottom support plate in position. A method for assembling the structure is described.