This invention provides improved methods and compositions for achieving material coloration using particle scattering These coloration effects can be designed to be either highly stable or dependent upon the switching effects of either temperature, integrated thermal exposure, moisture absorption, or exposure to actinic radiation. The electrode system is laid on the base. In addition, the system includes differential logic for adjusting the wheel brake command by first and second amounts to produce first wheel and second wheel brake commands, respectively, the first amount being different from the second amount. Each pixel is instrumented with a transducer to sense pressure, temperature, light, strain, etc. When the same disk is played back layer, the picture quality adjustment data corresponding to the disk are read out from the first memory to execute picture quality adjustment. According to the method, a description of a data structure is sent from a first application to a second application, and there is received from the second application an identification of at least one portion of the data structure that is requested by the second application.