This patent application discloses a camper shell for a vehicle. The network accessible computers implement host computer programs which permits the network accessible computers to operate as host computers for client computers also connected to the network, such that input devices of the client computers can be used to generate inputs to the host computers, and such that image information generated by the host computers can be viewed by the client computers. Alternatively, the controller can also include a battery that is charged from the mechanical waste energy. Said watermark sub-patterns Wi are locally weighted using said determined local weight factors. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims. The device comprises a substrate formed of transparent plastic, and two optical layers formed on inner and outer surfaces of the substrate respectively.