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An artificial rainbow lit up the night sky Wednesday.

But fear not, fellow Tulsans. It was simply a test of the “Global Rainbow,” a temporary installation created by artist Yvette Mattern to draw people from all four directions to the Gathering Place.

The laser lights — red, orange, yellow, green, blue and violet — will be aimed in a different direction over the next four days: first north, then east, then south and then west.

“The idea is that we will be aiming this at the four corners of Tulsa as a light of unity, as a beacon to draw all of Tulsa to the Gathering Place,” said Tony Moore, Gathering Place park director.

Mattern, a Puerto Rican-born artist who now divides her time between New York City and Berlin, first created the “Global Rainbow” in 2009, inspired by something she saw two years earlier.

“I was driving past Walden Pond (the Massachusetts body of water made famous by Henry David Thoreau) and saw this incredible natural rainbow,” Mattern said in a interview late Wednesday night after the final test of the installation, “and I knew I wanted to create a light work on the scale of that.”