These drawings are reminiscent of 3D scans, or perhaps sonar scans / seismographs. They are a tricky thing to get right, and more often that not, a piece will end up being worked to the Nth degree, to disguise a mistake. But that's what makes these intriguing to do, because there is always a point when an unexpected bit of magic happens, and the piece will suddenly come together, or display some surprising effect.
Above: Vibration ( 2 Torsos ), Pen and Ink on A3 Paper
Above: Female Figure, Pen and Ink on A3 Watercolour Paper
Above: Female Figure, seen from below, showing 3D Effect
Above: Reclining Figure, seen from below, showing 3D Effect
Above: Venus, Pen and Ink on A3 Watercolour Paper
Above: Woman Disrobing, Pen and Ink on A3 Watercolour Paper
Above: Woman Disrobing 2, Pen and Ink on A3 Watercolour Paper