Of all the things I know the most

Three volumes, each with exactly the same volume, are stacked on top of each other in front of a curved wall. The three volumes are based on three shapes; a circle, a cross, and a rectangle. The bottom volume is a circle extruded and flocked with the sawdust of waterproof MDF, the same material from which all the volumes are made. The middle volume is a cube, extruded across all three of its axes, creating a three-dimensional cross or plus sign, sprayed in an aluminum color, mat. It vaguely reflects its surroundings in color. The upper volume, an extruded rectangle is painted high-gloss black, reflecting its surroundings tightly and dark. On the wall hang four curved panels containing bended sheets of brown insulating material, like a large window frame overlooking an organic universe.