A reference cell programming system comprising a memory device and a tester. \u03c1OPT is a minimum value of the radius of curvature of the movement locus Lc1, and is determined from an evolute e of the movement locus Lc1. An instant messaging device buffers messages and delivers them to the recipient when the recipient comes online. Each pad is disposed on the cathode in spaced relationship to and aligned with one of the at least two colors, respectively, wherein electrons from each of the plurality of pads of emitters that drift from its intended phosphor are encouraged to drift toward an adjacent phosphor of the same color. The system disclosed herein allows for an improved low cost manufacturing, without the use of special tools or an ample array of structural elements. Furthermore, a wall mount assembly kit may include assorted clips or brackets for attaching to different slat wall configurations.