Brooklyn Borough President Marty Markowitz celebrated World Tai Chi Day with Park Slope Tai Chi Chuan Master Tzyann Hsu and her class in Prospect Park. This year marks the 10th anniversary of this annual, world-wide event, where Tai Chi devotees from over 60 countries practice their art, generating Qi (life energy) and creating a wave of Tai Chi energy that circles the globe all day long. A long-time Park Slope resident, Hsu teaches Tai Chi Chuan at the Brooklyn Branch of Yee’s Hung Ga International Kung Fu Association as well as at the Park Slope Senior Citizens Center and Prospect Hill Senior Services Center.