Out from the Shadows: Finding useful public space in an unlikely location, Toronto transforms a highway underpass into a lively park that glows at night. Underpass Park PFS Studio. Toronto, 2013 (by Lisa Rochon, via Architectural Record) Dark and neglected—that's the kind of derelict space that lurks below most highways and elevated roadways. Cities in the process of densifying, however, can no longer afford to ignore such concrete underbellies. Toronto, which has been busy completing 70,000…