Salesforce is opening its colossal tower rising above the San Francisco skyline with great fanfare Tuesday.

The lights will go on at the top of the tallest building west of the Mississippi this evening to display a permanent multi-million-dollar art installation by San Francisco artist Jim Campbell. A 15-minute fireworks display is also scheduled to explode from the top of the 61-story building on Mission St. at 8 pm.

The art installation consists of 11,000 LED lights that can display low resolution moving color imagery.

Campbell has placed cameras around the city that will take photos during the day which will be displayed on the building's crown at night.

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"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.

Salesforce tested the lights on many nights in April and May, and the tip of the building was set aglow. On one night, it changed different shades of soft blues and purples, a psychedelic lava-lamp swirl of color among the towering, straight-lined buildings.

Another night a rainbow of colors lit up tiny little boxes, and a video of a city street scene with cars passed by appeared at another.