From Epicurus to Sam Cooke, the Daily News to Roots, Gregory Pardlo’s collection “Digest” draws from the present and the past to form an intellectual, American identity. In poems that forge their own styles and strategies, we experience dialogues between the written word and other art forms. Within this dialogue we hear Ben Jonson, we meet police K-9s, and we find children negotiating a sense of the world through a father’s eyes and through their own.