More than works of art, Marcello Maloberti makes devices that stimulate public interaction, resulting in an event that is something like a party or fair. This exhibition, “Tagadà,” which incorporated a number of elements Maloberti had previously used in a long and complex performance in 2006 at a psychiatric hospital outside Milan, was named for an amusement-park ride in which riders sit in a large bowl that spins around and jolts them about—presumably, the artist wanted to shake his viewers up in the same exhilarating way. At the entrance to the gallery, the viewer encountered first a