We live in a physical world of things that you can reach out and touch. It's a world of solid matter, and the same world exists in the Suzerain universe. Many Suzerain inhabitants call it the 'solid world', in contrast to the spirit world. The physical world is easy. It's the grit you pick out of your teeth, the pork cooking in the next room, and a hearty slap on the back. The world of the spirits is trickier to understand, but not unobtainable. A lot of Suzerain stories have a link to the spirit world one way or another.