Edge Effect is Sandra McPherson's most original work to date. Constructed in two parts, the collection embraces secretly related worlds: the poetics of natural history and artistic discoveries of self-taught folk artists. Throughout, waves from one poem mark the shores of others. In natural history, an edge effect occurs where two communities, such as land and sea, overlap, that zone becoming more diversified than each of them. McPherson explores this effect in nature and art, questioning our notions of inside and outside, center and margin. Profound and moving, she recasts the very premises of formal understanding in poetry, accommodating at once the arts of nature and the nature of art.