Light show, Summer of Love exhibition, De Young Museum, Golden Gate Park, San Francisco, California, U.S.
<a href="//commons.wikimedia.org/wiki/User:Jmabel" title="User:Jmabel">Joe Mabel</a>
CC BY 4.0
Photo by <a href="//commons.wikimedia.org/wiki/User:Jmabel" title="User:Jmabel">Joe Mabel</a>