The Whitney Museum of American Art, the most ambitious of the big museums hereabouts, has an art show going on that does more than hang on the walls -- it dances, sings, pulsates, hums, pings, pongs and more. At least the movable feast that Jonathan Borofsky created for his first retrospective did a few weeks ago.

Borofsky has been grouped with the neo-Expressionists and called a latter-day "happenings man," but he is neither. He is a one-man movement, and what a movement: Only 42, he already has the stuff for the much revered retrospective normally awarded an older artist.

In his current show, which takes up a floor of the bug-eyed fortress on upper Madison Avenue (at 75th Street), Borofsky has pulled out all the stops. Against the sound of visitors playing Ping-Pong on a specially designed table, a 14-foot painting/construction wields a hammer like a 19th-century ironmonger. Another figure, shrouded in bubble wrap, pulsates eerily, like a futuristic demon. An 11-foot clown sings and dances with gay abandon.

Then there is the series of computer-programmed blue neon hoops, flashing on and off, and figures flying through the room, and paintings that talk back, and a Borofsky video.

Too much? It is. And it isn't.