Way back in 1967, Darryl "Cornbread" McCray started tagging Philadelphia's walls to get the attention of a girl he had a crush on at the time. From there, his simple act grew into a phenomenon, and graffiti as we know it was born.

Graffiti expert Roger Gastman will explore that history with Wall Writers, a feature-length documentary from BOND/360 on the subject that will see a Philadelphia premiere at International House on Saturday, June 25 at 7 p.m.

Cornbread will be in attendance for a Q&A session following the film's screening alongside fellow graffiti originators Kool Klepto Kidd, Cool Earl, and Lewis, among others. Gastman will also participate in the Q&A.

The film itself chronicles the birth of graffiti here in Philadelphia and in New York City from 1967 to 1973 — when the first graffiti painting was sold. Through archival footage, photos, and interviews with graffiti greats like Cornbread, LSD OM, and TAKI 183, Gastman's doc offers a rare look at an art that transformed the urban landscape. John Waters narrates.

Tickets for the Philadelphia premiere of Wall Writers — available now — run $9 for adults, and $7 for students and seniors.