Contributed by Rachel Youens / The sculptures in Jim Osman’s show “Walnut 3,” now at McKenzie Fine Art, are both architectonic and playful. His constructions, placed on pedestals, are formalist balancing acts made of found lumber, some elements lightly reworked, that are stacked and arranged. Osman’s overall intention is to find a complex situation for entry, where forms assembled from Euclidean solids generate stability or dynamism through exquisitely contrasting proportions and scale. The experience of seeing unfolds in the extended time required to walk around each small free-standing work.