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PHILADELPHIA (AP) - A new interactive artwork opening in Philadelphia will make light of your words, but it's probably not what you think.

The work called "Open Air" runs Sept. 20 through Oct. 14. It will translate voice messages into moving beams of light over a tree-lined parkway named for Benjamin Franklin in the heart of Philadelphia's cultural district.

An iPhone app records wishes, gripes, observations, questions or shout-outs of up to 30 seconds. Viewers can then watch as 24 robotic searchlights slowly sweep the night sky in patterns and intensity determined by voices and GPS location.

On clear nights, it will be visible from 10 miles away.

Montreal-based artist Rafael Lozano-Hemmer created the work. His installations have been seen worldwide, but "Open Air" is his first outdoor searchlight project in the U.S.