Three Reclining Figures, 1975.
Sheep Grazing, 1972
My brother had a book of drawings by the British sculptor Henry Moore. I was always impressed by the quality of the drawings, though I was (I now think, strangely) puzzled that he needed to draw in order to develop his ideas.
Really, it meant that he moved a 0-dimensional point through time, to draw 1-dimensional lines on a flat 2-dimensional sheet, to express 3-dimensional forms that were bound by the wonderfully curved 2-dimensional surfaces. The hand, the eye and the brain are amazing creations indeed.