BEACHWOOD, Ohio – An abstract acrylic-on-canvas collage and enamel-on-aluminum work by African American artist Sam Gilliam (b. 1933-) is the expected headliner in an online-only May Modern auction scheduled for Saturday, May 28 at Neue Auctions, starting at 10 am Eastern time. Absentee and Internet live bidding will be available through LiveAuctioneers.