''THE Thinker'', the best-known bronze sculpture by sculptor Auguste Rodin, has just been flown in from Paris to be exhibited at the ''Rodin Sculpture'' exhibition to be held in the Hongkong Museum of Art. As the sculpture, in its original size, is an unusual exhibit in the Rodin Museum in Paris, it has been hand carried to Hongkong for the exhibition which will run from April 30 to June 2. The other 56 sculptures to be displayed in the exhibition will arrive later after touring Beijing and Shanghai. Among them will be some of the finest of Rodin's original works ever shown overseas. Exhibits include the most representative pieces like ''The Gates of Hell'', ''The Kiss'' and ''The Burghers of Calais''. The exhibition is jointly presented by the Urban Council and the Association Francise D'Action Artistique of the French Ministry of Foreign Affairs. A number of educational activities will be organised to support this exhibition. A workshop featuring a guided tour and a demonstration on the sculptural technique of clay modelling will be organised daily, except Thursdays and Sundays, from May 3 to June 2. There will also be special tours arranged for the underprivileged on Thursdays. For more information, call 7342155. In addition, a lecture in French on ''The Extreme Orient in the Cambodian Dancers of Rodin'' will be given in the Museum's Lecture Hall on May 1 on 2.30 pm. The English interpretation will be conducted by Dr Genevieve Schaeffer. Admission is free.