The black area is 3 layers, with the bottom two stitched together at the selvedges, and the top layer free.
The coloured areas are all one big pocket, with alternating colours forming smaller pockets on top. These could be stuffed, or have cables/lights inserted into them, or stiffened and cut open to reveal layers behind. Where the green tubes meet the edges, there is an opening into the tunnel.
Each colour uses two wefts and 2-3 warp colours. This allowed the layers to pack down evenly, made each layer thicker, and colour areas sharper, and allowed for a wide variety of shades and colours.
In order to have all the colours as one big pocket, I had to reserve the black and white warp threads and the black weft for the background in all the colour areas. If I used the black weft in any of the colours on the surface, it would have stitched the big pocket together.