- One side blue and yellow (divided on the diagonal)
- One side red and white (divided diagonally)
The character of the colors is indicated on the page of designs (pp. 360−1) in this article. A slight difficulty experienced by possibly one or two subjects out of every 100 was a just perceptible but nevertheless disconcerting difference in shade between the blue and yellow on the full faces and the same colors on the diagonal sides. This can be remedied in the later standardization of the test material. One set of the blocks will last through the examination of from four to five hundred children without showing much wear and tear. After that the cubes can be repainted without difficulty.
It is interesting to watch the response of children and even adults when they are given colored cubes to handle. There is no doubt that an appeal exists which touches the roots of some very fundamental original tendencies. Of all the subjects tested, not one has manifested any absence of a desire to combine these cubes in some fashion. The experimenter needs only to direct this natural interest toward a specific end and then apply a scientific measuring technique to evaluate the results.
2. The Designs
In Chart I. the seventeen designs utilized in this test are represented. The Arabic numerals designate the final numbering of each design. The original number was 35 but fifteen were eliminated in a few of the early preliminary testings. The designs are graded in difficulty which increase by modifying the designs at various stages in the following manner:
- 1. By the use of the full colors;
- 2. By the use of few diagonaled sides;
- 3. By the use of all diagonaled sides;
- 4. By turning the design on one of its corners;
- 5. By eliminating the outside boundary line;
- 6. By increasing the number of blocks to be used;
- 7. By increasing dissymmetry in design;
- 8. By decreasing the number of different colors used in each design.
