This invention provides a 1R1D block architecture magnetic memory device. The screens have rods vertically arranged parallel to one another and have wires horizontally arranged parallel to one another. The roller includes a shaft and a roller wheel coupled to one end of the shaft. A value representative of the current state of the attribute is transmitted via the second network to the display device upon a change in the state of the attribute from a previous state of the attribute, and the value is displayed on the display device.