In the practice of Feng Shui, tables symbolize health and energy, so they should be clean, tidy and as inviting as possible. Placing live plants or flowers on the central table is good for the health of people sitting in your living area, and the air is cleansed too. However, take care to avoid having plants with thorns, or very straight or spiky leaves. Plants with rounded leaves are better for energy flow. Live flowers and plants help the balance of yang and yin energy too, so have several good purposes. Another wonderful technique is to set photographs of family members on tables, because this is an immediate mood-enhancer when you go into the living room.