A 3D object according to the invention comprises substrate layers infiltrated by a hardened material. In one embodiment, the computer system comprises a clock generator, at least one processor, and a clock frequency controller. In its storage state, the ballot box is a compact unit with wheels and a handle that can be comfortably transported andor stored. Fabrics in the second section are not compressed and are not joined other than to prevent slippage of the fabrics relative to one another.