The constant shifting from bright to dark is so nice here, and done with such sophistication. Even with the constant shifts and unexpected harmonies, nothing feels jarring, so it still really works as a berceuse. You are still lulling the baby. I particularly liked the arpeggios in the last few measures. I also liked the smooth transition from the simplicity of two lines, to adding the occasional chord, to three independent lines, back to two lines, but now with thicker harmonies as the piece progresses. Another great piece!