In a system in which data employed by a computer is stored in a storage system, the storage system transfers this data to another storage system and a copy of the data is maintained in the other storage system. Such content is content consumed by a system that projects a scene view on a surface, such as a wall, screen, or floor, and is interactive with user motion. This way, only a memory cell which is being used needs to be refreshed, thereby saving power. Spatial statistics may be generated from the macroblocks in the \u201cI\u201d frame. The first amount and the second amount of the selected etchant may or may not be the same. This transformer can be designed as power transferable as well as waveform convertible, applicable in power systems or power electronics.