These beguiling canvases feature depopulated plazas, stairwells, and vestibules, the angled planes of modernist architecture recreated in slabs of grayed-out blue, dirty yellow, and clotted red. Snaking handrails provide a sinuous counterpoint to rectangle, square, and trapezoid, drawing the eye into virtuoso palette-knifing and brushwork. The bleakness of these concrete-and-steel dead zones is transcended by Hellmich's sharp formal instincts, which make abstract slats and checkerboards surprisingly beautiful.