WHAT'S NEW AROUND TOWN IN OUTDOOR SCULPTURE
IF there is no feast of outdoor sculpture this summer, there is also no famine. This is the year in which the widely acclaimed Isamu Noguchi Garden Museum opened in Long Island City. And the controversy over Richard Serra's ''Tilted Arc,'' in Federal Plaza, has probably focused more attention on public sculpture than ever before. The outdoor sculpture this summer is strong in two directions. One is political. There is challenging work by Vito Acconci, David Finn and Dennis Adams that is determined to focus attention on particular social issues or on the message of the media in which issues and desires are presented and defined. There is also a flourishing body of sculpture that is constructed and architectural, yet filled with a broad range of content. As much as the political work, the large, constructive sculptures by artists like David Seccombe and Elizabeth Egbert exist outside the gallery and museum system.