Sally Maxwell Blends Art, Mathematics, and Wildlife in Her Distinctive Scratchboard Work   Scratchboard is a subtractive medium that Sally Maxwell has moved toward becoming an additive medium as well. The medium consists of etching away black India ink from a white clay subsurface, using fine-tipped tools—one painstaking line at a time. For Maxwell, the process evokes emotions she can’t find in other art forms. “It feels so good to work with it,” she says, adding that her personal satisfaction stems from the way she’s wired—specifically mathematically. Many artists of her caliber came through top-tier art programs in college, but
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