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Where to buy...Michael Schultheis

Schultheis brings color to theoretical geometric forms.

Like scores of artists before him, Michael Schultheis grounds his painterly flights-of-fancy in mathematical principles. The ancient Greeks employed the golden section, and Da Vinci had his Fibonacci sequence, while Georges Seurat drew from new optical theories to meticulously arrange his colored dots. Obsessed with Euclid’s Optics and Menelaus’s Sphaerica, Schultheis describes his own works as riffs on ideas found in those classical treatises—a “personal narrative” using theoretical geometric forms. Math-fearing connoisseurs needn’t despair, however. As luck would have it, advanced spherical trigonometry is pretty easy on the eyes. At Froelick Gallery, 714 NW Davis St., Portland, Ore., (503) 222-1142. Through Aug. 27. Prices range from $3,500 to $16,000.

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