Culture is shaped as much by what is not known as by what is, and Finch's works track the blurry border between. Many people still wonder what really happened in Dallas on Nov. 22, 1963. Emily Dickinson and Henry David Thoreau pushed language to the limits of its ability to describe the ineffable. One of Finch's sculptures, an oval panel covered by rhinestones representing the color of the sky over Roswell, N.M., alludes to a place where some people believe beings from other, unknown worlds have visited.