Rules for the drawings:

1. Each drawing can only be made with the same size ellipse.
2. The ellipses must always lie in the horizontal.
3. The ellipses may not transect the edge of the paper.
4. A complete ellipse may not be drawn.
5. In each position of the ellipse stencil at least three lines
x.xmust be generated.
6. Only lines may be generated, not points.

Additionally, for the small drawings:

7. Every sheet of paper measures 34.3 x 43.4 cm.

Additionally, for the color drawings:

8. Seven colors or more must be used for each drawing.