The major space in the Portland Open Space Sequence, the Ira Keller Fountain, opened on June 23, 1970. “Halprin knew how to engage the public, and his flexible, bottom-up approach often enabled him to get projects built,” said Laurie Olin, landscape architect.  Modern Spaces in the Pacific Northwest by William Lamb from Remembering the Forefather of Urban Renewal, Lawrence Halprin