By Stiven Peter In his “Conversations with Picasso,” Hungarian photographer Brassai claims that Grunewald’s Crucifixion awakened Picasso’s creative impulses. Specifically, he attributes Picasso’s extremes, “his amorously irreverent pastiches, his verve, his humor, his cruelty,” to the grotesque impulse generated by Grunewald. Picasso remarked to Brassai, “Do you know the Crucifixion of Mathias Grunewald, the central