It brings about a various effect for mental and physiology of a human being by decorating indoor "Green", not only to make the indoor beautiful. It brings a greatly side effect such as to get rid of technological stress, to purify indoor contamination air, to regulate an air conditioning, to gather people and to bring an economic effect indirect.     The plants can produce appropriate humidity As you know, the air tends to be dry due to heaters in winter. In order to avoid these kinds of dry condition, we propose you to have enough plants in your room. But, be careful. In summer time, it can be high humidity if you put too many plants in your room.     The plants can produce air purification Recently, we have facing the air pollution by volatile compound such as benzene. According to Nasa's study, some kinds of bacteria which live on the soil of ornamental plants can decompose and filter contamination.