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    In the Window Plate and Forilux the character of the installation does not end with the mounting of the prisms; but the prism lenses themselves are manufactured in great variety of shapes and with widely differing surface patterns and effects. Innumerable combinations of these single lenses in surface patterns, bands and lines may be made.
    In nearly all of the prescriptions of Luxfer Prisms which are found in the table headed "Luxfer Prism Prescriptions," more than one kind of prisms are used. Those which are indicated by the heavy type form the body of the plate and throw the light into the main part of the room. We call these the MAJOR PRISMS. The other one or two prisms designated by a lighter type, are designed to throw the light in the front part of the room. We call these the MINOR PRISMS. It is evident, therefore, that from any one particular point in the room the prism plate will be shaded in some parts, because some prisms throw the brightest light in one direction and others the brightest light in other directions. This gives an opportunity to the architect to place a design in his window, and this design is seen very clearly both from the inside and from the outside. In the back part of the room in general, the major prisms of a plate, indicated by heavy type, are very bright, while the prisms indicated by the lighter type are darker. In the front part of the room the reverse takes place, the minor prisms being very light and the major prisms darker. On the outside of the window the minor prisms are usually several shades brighter than the major prisms. A few of the designs which have been used with satisfaction in Luxfer Prism plates are shown by the illustrations.
    A Canopy differs from a Forilux in that the plate of prisms is fastened at its upper edge to the wall over the opening, the lower edge lifted until the proper angle for best receiving the light is secured, and it is then fastened in this position by chains or brackets as the conditions may require.
    The prism lenses used in a canopy are of a heavier nature than those used in a forilux, and the construction of the frames and supports much heavier and more complicated, as they are oftentimes so constructed that they may be closed or lifted entirely.
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 16