For Halprin, a hike amongst the redwood trees was incomplete without a notebook in hand. The Halprin Personal Drawing Collection includes a number of nature studies created on family hikes in the High Sierras and other locations near his California home and Sea Ranch. The Topographic study, from the collection of SFMoMA, is both an academic sketch of the Earth’s surface and a visually mesmerizing work of art, in which lines break away from the accuracy of scientific illustration and reveal the expressive process and meditative state of its creation.