Immersed in a medium. As figures in a painting. Limited in nature. Rules must be followed. Like an aquarium or a terrarium. Movement limited. Finite in nature. The medium inhabited, fluid. The medium four D. The painting ever changing. But rules always apply. Like the painting on the wall, the medium observed. Running smoothly. The results, uncertain. Yet holding the interest of the Cosmos. The Cosmos a living thing. A creating thing. Brush strokes creating. Like a picture on the wall, limited it be!