Released in 2019, the design was created by artist and architect Hiroshi Sugimoto, who is responsible for Hirshhorn’s Redesigned lobby in 2018. Sugimoto proposed new entrances and the reopening of an underground passage under Jefferson Drive connecting the garden with the museum square. The original plan to reorganize the garden into three spaces, including one for performances, changed the shape and size of its reflecting pool, and replaced some of the walls. stone concrete stacked on top of each other.
https://www.washingtonpost.com/entertainment/museums/hirshhorn-sculpture-garden-redesign-approved/2021/12/02/cb76de32-5389-11ec-9267-17ae3bde2f26_story.html Hirshhorn Sculpture Garden redesign approved