“Islands,” which comprises one hundred works in 48,000 square feet of demanding postindustrial space and marks Vicente Todolí’s trial run as HangarBicocca’s artistic adviser, is a massive show, big enough to encompass Dieter Roth’s total lifetime undertaking of smashing and annihilating boundaries, whether temporal, spatial, or conceptual. Making radical contributions to performance, sculpture, painting, poetry, graphic design, publishing, filmmaking, and music, Roth seemed to aim more than any other artist at an ensured permanency or—better yet—immortality. Supporting that legacy,