Photos: ‘Invisible Skies’ turns San Jose City Hall plaza into a luminescent art piece with the help of 2,000 participants.

San Jose City Hall’s plaza has seen lowrider shows, a huge EDM concert, protests and more. But it’s never looked like it did on Saturday when 2,000 people covered the plaza with illuminated umbrellas.

It’s part of a “flash art” event called “Invisible Skies” by artist Elizabeth Turk. The illuminated umbrella props were illustrated with constellations, planets and other heavenly bodies. Participants — wearing all black — moved and danced around the Janet Gray Hayes Rotunda as it was recorded...