Here is what the designers explain:
“The lighting used to highlight the works inside would softly pour from the translucent plastic walls, and their gentle glow turned the greenhouses into large lanterns of light. Moreover, winding ”trails” of black stapled carpets ran throughout the exhibition venue, with white vinyl panels for displaying the works positioned alongside there “trails”. While keeping costs low, we were thus able to create the semblance of “farmland” that partitioned the area where people would walk and where the works would be displayed. This form of expression was in fact an expanded version of the “home-use greenhouse” that we had used at our pre-event venue held half a year earlier, and we found that this environment was most suitable for expressing the development and growth of crafts in the unique “soils” of Kanazawa.”
http://www.dailytonic.com/first-interenational-triennale-of-kogei-in-kanazawa-exhibition-design-by-nendo-jp/