The boundaries of Occupy Wall Street expanded beyond Zuccotti Park over the weekend, as a splinter group briefly took over an art gallery in SoHo. On Saturday, during a talk about conceptual art at the gallery, Georgia Sagri, a Greek artist, suddenly rose and shouted out, ''This is an occupation,'' witnesses said. About a dozen other people joined Ms. Sagri in declaring the gallery, Artists Space, an autonomous zone. They handed out fliers and taped pieces of pink paper to a wall headed ''Rules of the Space.'' [ABSTRACT FROM PUBLISHER]