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discuss them freely. The diagram of |c| **= 7 is shown by Figure 3. Images of the artworks are attached to the**
corresponding nodes.

The four diagrams that include the switch objects were presented **in the part 2 group discussion. Finer and**
coarser granularity diagrams (|c|**=3, 5, 7, and 8) were presented at the same time as in the part 1 group discussion.** The diagram of |c| **= 7 is shown by Figure 4. The subjects could recognize the switch objects, compare the strong**
and weak preferences, and obtain a clue to their unconscious preferences by interpreting and explaining the diagrams in the group discussion.

The answers to questions Q2 to Q8 were used in three analyses. Questions Q5 and Q6 are for the first analysis:
the evaluation of the reflection process. Questions Q7 and Q8 are for the second analysis: the analysis of the characteristics of the topics that helped the subjects become aware of their unconscious preferences. Questions Q2 to Q4 are for the third analysis: the analysis of the characteristics of the unconscious preferences of which the subjects became conscious. The second and third analyses are demonstrated in 3.2.

Here, the first analysis is demonstrated. A summary of the answers to questions Q5 and Q6 are shown in Table 2. Every subject agreed that the preference diagrams were useful in the part 1 group discussion. Most subjects agreed that they were useful in the part 2 group discussion. The answers indicate that the visualization tool, like the preference diagram, is useful in general. The reason some did not realize their unconscious preferences is analyzed below with the third analysis.