As Zen takes root in the west, new forms arise. For centuries Zen masters have tested their students with koans and capping phrases. A koan is a spiritual paradox that must be solved intuitively. A capping phrase is a trenchant comment. Both are meditative practices that reveal deeper truths about the self and, ideally, lead to enlightenment. In Zen Traces, Buddhist scholar Kenneth Kraft plays off these practices in a new idiom. He selects passages from four sources: traditional Zen, present-day Zen, Henry David Thoreau, and Mark Twain. When a koan-like story about a contemporary Zen teacher is paired with a pithy comment by Mark Twain, something fresh emerges.