OuiSi is an elegant teaching tool. I have used OuiSi Nature for a number of years with my graduate students, to help foster a learning environment for creative, connected thinking. The OuiSi experience (even the name "OuiSi" - so nuanced!) never fails to surprise and delight adult learners. OuiSi looks and feels lovely to play, and adult learners take tremendous pleasure in stretching their minds in this low-risk, high-reward context.
I'm currently using OuiSi with a mixed-grade elementary class in a land-based education program. The game is much more chaotic in this setting, and every bit as rewarding. The more often students play, the more subtle and imaginative their connections become. Half the fun for this class now is figuring out why another person placed a card as they did -- and you can imagine how powerful that is in fostering connection and observation skills amongst the students themselves.