| http://www.w3.org/ns/prov#value | - A diffraction cell 170 is shown in FIG. 38B. Examples of suitable diffraction cells are also shown in FIGS. 3A and 24B. A structure facilitates the entry of light into the diffractor 170 by directing light (e.g., lens, mirror, waveguide or other light directing element) and/or situating the diffractor 170 so that light engages the diffractor 170 at an angle to the plane of the diffractor 170 (e.g.
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