Fig. 38.
Fig. 39.
Figs. 40 and 41 are made by using one form with alternation of tone and of position. Fig. 41 is derived from Fig. 40 by laying the dark squares with the corners in contact and placing the light squares over them.
Fig. 42 shows alternation of form and color or tone, which is also the scheme employed in Fig. 43 in a design less simple with the addition of the half-circles.
Figs. 44 and 45 show two other simple and pleasing designs with alternation of both form and tone or color.
Figs. 46, 47, 48, and 49 comprise designs in two forms and two tones or colors, in which some hand cutting is necessary on the part of the pupils.
| Fig. 40. | Fig. 41. |
| Fig. 42. | Fig. 43. |