Berkeley’s Mortar Rock Park is named for the many hollows worn in the clusters of boulders by Native Americans pounding and processing acorns and other seeds. The small park, with majestic bay and buckeye trees, was a popular destination for my kids when they were younger. So, when a local environmental group, the Friends of Five Creeks, approached me to develop interpretive signage for the park and other notable nature spots in the area, I was only to happy to help. Working with illustrator John Muir Laws, we developed a series of metal signs that harmonize with the neighborhood’s arts and crafts architecture. Look for them at Mortar Rock, Strawberry Creek, and other locations in nearby parks.