Contributed by Jeffrey Grunthaner / Currently on view at MASI Lugano in Lugano, Switzerland, Rita Ackermann’s solo show, “Hidden,” offers a rare melding of museum-oriented historicism with gallery-style directness. Occupying two cavernous rooms in the museum’s bottom floor, the exhibition comprises four bodies of work, ranging from early sketchbook collages prefiguring Ackermann’s iconic “nymph” paintings of the 1990s to more visceral canvases that explore erasure and disappearance. It culminates in three monumental paintings from Ackermann’s most recent series, War Drawings, which recall murals while also resembling magnified pages of an exploded notebook.