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One of the recurring tricks in the tool kit of extraordinary Chicago sound artist Olivia Block is to toy with the listener’s perception by playing with the boundaries between natural and artificial sound. Back in 2003, as part of the long-running Florasonic series in the Fern Room at the Lincoln Park Conservatory, she created a purely electronic installation that meticulously mirrored the space’s babbling water sounds before zooming into white-noise abstraction, prompting attendees to think about what was real and what wasn’t. Tonight Block premieres a new site-specific work that uses the massive organ in the spectacular Rockefeller Chapel on the campus of University of Chicago.…