What is the author's style in Towards a Poor Theatre by Grotowski?

Towards a Poor Theatre, as edited by Eugenio Barba, is a collection of essays, interviews, and notes reprinted from other sources. Though the majority are either written by Jerzy Grotowski or directly dictated from him, other sections are not and are included to further illuminate the theories and methodology of Grotowski. Chronology is not necessarily honored; the unifying aspect is simply Grotowski's early theories (pre 1968, when the book was published).