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Not pictured is the screening machine, which basically forces the coffee through progressibly smaller metal screens to separate large seeds, average flat beans, peaberry, and broken bits. Here is the magic device called a density sorter, a tiled, shaking, air-bed for coffee that does amazing things. Dense coffee (the good stuff, shakes to the high side (left) and bad lightweight coffee falls to the low side (right). It's opposite of what you would think, but it's the effect of the air and the shaking motion.