Keep on Truckin' by Robert Crumb
Keep on Truckin’ by Robert Crumb (R. Crumb) was first published in Zap Comix # 1, in 1968. ‘Keep on truckin’ is also a phrase from the 1930s song “Trucking My Blues Away” by Blind Boy Fuller. The forward stepping foot was a symbol of the hippie counter-culture in the late 1960s.