A com­mem­o­ra­tive Negro Leagues base­ball stamp, depicting a player sliding safely into home plate, was unveiled by the U.S. Postal Ser­vice at Northeastern’s John D O’Bryant African-​​American Insti­tute on Thursday, part of a series of events and pro­grams con­nected to the University’s ongoing art exhibit on the his­toric leagues.

The exhi­bi­tion at Gallery 360— “Shades of Great­ness: The Art of Negro Leagues Base­ball” — includes 35 paint­ings, pho­tographs, etch­ings, three-​​dimensional instal­la­tions and signs cre­ated by local and national artists, and closes on Friday.

Over the past two months, North­eastern has col­lab­o­rated with the Boston Red Sox and the Boston Foun­da­tion to enhance the under­standing of social issues and aware­ness of the con­tri­bu­tions of Negro Leagues base­ball players. Northeastern’s Office of Insti­tu­tional Diver­sity and Equity worked to bring the exhibit to Northeastern.

Part­ners in the exhibit as well as spe­cial guests from the Negro League Base­ball Museum and the United States Postal Ser­vice praised its artistic, his­tor­ical and intel­lec­tual value.

The exhibit has sparked an intel­lec­tual dia­logue on sport and race in the com­mu­nity,” said Dr. Ray­mond Doswell, the Negro League Base­ball Museum’s vice pres­i­dent for cura­to­rial ser­vices. “It doesn’t matter who hit the most home runs or stole the most bases; what’s impor­tant is under­standing why these players par­tic­i­pated in a game despite what was hap­pening to them.”

Susan Good­enow, senior vice pres­i­dent for public affairs and mar­keting for the Boston Red Sox, added, “It’s impor­tant to share the his­tory and tell of the con­tri­bu­tions that Negro League players and teams made to our national pastime.”

She said groups of chil­dren from Major League Baseball’s Reviving Base­ball in Inner Cities pro­gram have vis­ited the exhibit since its opening in mid-​​May.

Andrea Mar­tinez, a pro­gram asso­ciate for the Boston Foun­da­tion, called the chance to work with North­eastern, “an oppor­tu­nity too good to pass up,” noting that the exhibit has sparked sig­nif­i­cant interest among the foundation’s donors.

The Negro Leagues were the per­fect sub­ject to depict on a new stamp, added Boston Post­master James Hol­land. “Only sub­jects or events with wide­spread, national appeal make it,” he said.

Former Red Sox players Dennis “Oil Can” Boyd and Sam Horn were among those in atten­dance at the event.

A quartet, led by North­eastern music pro­fessor Leonard Brown and African-​​American studies chair Emmett Price, opened the event with the tra­di­tional Negro National Anthem, “Lift Every Voice and Sing.”