In Käthe Kollwitz’s “Woman with Dead Child‚” in a Museum of Modern Art survey‚ two figures become one in the mother’s tight embrace. Etching with drypoint‚ sandpaper; artist’s proof. Käthe Kollwitz’s fierce belief in social justice and her indelible images made her one of Germany’s best printmakers. A dazzling MoMA show reminds us why. An artist friend texted me recently‚ asking how to contend with the anger and sadness she was feeling about the state of the world. I can think of no better balm...