Neither work was completed. The sketch was done as an in-depth study to support his initial concept of the figural grouping for the fresco. This explains why portions of the figure drawing are unfinished in areas—figures in the foreground were to overlap this figure. It appears to have been done in two different values of black chalk; the initial quick gesture drawing is done in the lighter of the two chalks, while the contours and the modeling and shading is done with the darker one. The drawing has much to offer the student. Michelangelo created a strong sense of rhythm through his use of contour and form.