Once predominantly hand-painted or crafted from tubes of neon, signs became largely digitally printed and commercially manufactured over the years, although a current resurgence of the art of hand-lettering is taking place. Next Wednesday evening, the ICA LA will bring together two Angeleno artists to discuss the history of sign painting in Los Angeles. Ralph “Doc” Guthrie has been a commercial sign painter in Los Angeles for over four decades, and has taught in the Sign Graphics program at Los Angeles Trade-Technical College (LATTC) for 24 years — the same program he graduated from in 1974. One of his students was Michael C. McMillen, an installation artist and filmmaker whose incredibly detailed tableaux reproduce miniature versions of everyday buildings and structures