O’Halloran composed directly and quickly onto the support, often leaving patches of board visible and pushing form to the limits of legibility. In Green Bedroom, thick daubs of cream paint atop the magenta bedspread read alternately as dappled sunlight or as the textile’s pattern. Beneath the bed the warm brown of the bare board becomes a striped rug. Especially interesting in this respect is O’Halloran’s treatment of the many paintings that appear in his paintings; a few deftly placed strokes of paint are all that are needed to signal "landscape" or "portrait."

from Snay, The Donald and Marilyn Keough Collection of Irish Art (Notre Dame, 2019)