Back-flow incense burner creates an illusion of a smokey waterfall. simply place an incense cone at the top of the waterfall, and with the cone's special properties, the smoke starts to flow in the reverse direction, that is from top to bottom, and in turn, creates a beautiful smokey waterfall. Backflow incense might take 50-60 seconds to start Perfect Gift: It is the Best Gift for Marriage Anniversary, Parents, Mother's day, Wedding Return Gift, Business, Promotion, Retirement, Farewell events, Birthday, House warming, Office / Shop Inauguration, Festive occasions - Like Diwali, Griha Pravesh and Corporate Gifts