Dear Master Lee, Thank you for your prompt reply. Appreciate it very much. Indeed the front of my workdesk is a clear walk-path which could represent as water star. I need not activate this water star as it is a busy walk-path anyway. Back of me is window with blinds. How should I activate mountain star if the backing is not very strong? Also, another doubt, if the scenario happens to be back of me is my other colleague's workdesk (a back-to-back, four in one cubicle), does it mean there is no backing at all? And how to have it cured? Thanks once again, Doris