Visible 20 miles away: Salesforce Tower art lights up the SF skyline during testing Lights to become permanent fixture in May

Salesforce Tower on April 25, 2018: Lights glowing at the crown. Salesforce Tower on April 25, 2018: Lights glowing at the crown. Photo: Twitter Screen Grab Photo: Twitter Screen Grab Image 1 of / 28 Caption Close Visible 20 miles away: Salesforce Tower art lights up the SF skyline during testing 1 / 28 Back to Gallery

If you looked at the San Francisco skyline on recent nights, you might have noticed the lights were turned on at the top of the new Salesforce Tower.

The tip of the building was aglow Thursday night, changing different shades of soft blues and purples, a psychedelic lava-lamp swirl of color among the towering, straight-lined buildings.

A rainbow of colors lit up tiny little boxes at one point on Wednesday, and a video of a city street scene with cars passed by appeared at another.

The lighted artwork will be viewable from 20 miles away.

Helen Han with Boston Properties says that testing is beginning on the permanent multi-million-dollar art installation by S.F. artist Jim Campbell.

"We'll put them on permanently sometime in May," Han says. "We don't have a schedule. Over the next couple weeks, they'll be working out the kinks."

Campbells's work will be on view on the top six floors covered in 11,000 LED lights that can display low resolution moving color imagery.

Campbell is placing cameras around the city that will take photos around the city during the day and these will be displayed on the building's crown at night.

"The challenges for this work are truly unique with very little precedent. My goal is to create a work that brings the building to life as a dynamic element of the city, not to simply use the surface of the building as a video screen. I feel very lucky to have been given this opportunity to create a work for the city that I've lived in for over 30 years," Campbell said in a statement.

Campbell's work will be viewable from 20 miles away.