Back to the dobby loom. On a granite ground, little spots arranged in satin order (this pattern repeats after 5 spots). The spots are a weft satin, and each spot is surrounded by a 2-pixel ring of plain weave. You can hardly see the plain weave, but it does provide a separation or barrier between the granite and the satin.
The plain weave is a little more obvious in the draft. Here are two total liftplan repeats. Click to enlarge.