What do you give to an institution upon its 75th anniversary celebration? If it’s a marriage, you offer diamonds and gold. If it’s a cultural monument of the city, you give your complete attention. "Collective Future: Gifts in Honor of Philbrook’s 75th Anniversary," opens Sunday, Nov. 3, at the Philbrook Museum of Art, 2727 S. Rockford Road, Tulsa. While this exhibit honors the legacy of oilman Waite Phillips, who in 1938 gave his Italian Renaissance-style mansion and villa along with its artistic contents to the City of Tulsa as an art museum, it also spotlights the continuing generosity of philanthropists to the community’s benefit. Philbrook recently has received gifts from significant donors, and some of those works by such artists as Willem de Koonig, Edward Ruscha, Milton Avery and Andrew Wyeth will be part of Collective Future. The show runs through Jan. 26. Go to www.philbrook.org for hours, admission and related events.