Watermelon Rock, La Sandia. "Watermelon Rock, a human-made landmark at the Martin Luther King Regional Shoreline Park, was originally painted as an orange slice in May 1983 by local resident Sandra Gibson and a friend. A few years later, someone repainted the rock as a slice of watermelon. The mystery of Watermelon Rock is that no one knows who re-paints it or why—rumors of the artists’ identities range from mermaids to a local college sports team. Through the years, it has had stints as a lemon wedge and other citrus slices, but it always returns to its beloved look as a watermelon." source , Gastro Obscura, ND, https://www.atlasobscura.com/places/watermelon-rock More history on this landmark can be found here https://patch.com/california/alameda/watermelon-rock-a-slice-of-alameda-history