"the hippie spirit of the sixties" was always a fragile dream and a naive response, but in the face of the VN war and repression in the streets, what could we do? Some choose violence, some non-violence, and some pretended they could get loaded and live like they weren't subject to the state. It didn't last long (Death of Hippie was celebrated in 1967) but there were some groovy moments ....
Actually, most of this design and lettering was done by Victor Moscoso. Griffin drew the 3 panels at the bottom, and they probably did the color separations together. Both Rick and Victor are credited on this one.
The original poster and handbills were in black & white. Later Rick decided to do a color version of the poster, and came up with this double split fountain treatment. Due to the nature of that technique in which one pass bleeds red to orange while the other blends blue to purple, no two copies of this poster are exactly alike
Rick Griffin's color separations may be considered primitive or old fashion, but they were effective delivering his distinct primary based palette. He was always looking for the next level. He pointed out to me that when he did the seps for this one, he striped in the 3 primaries (cyan, magents and yellow) that were printed before (under) the black hopi mask. I'm not sure you can see it in books or other reproductions. That's another reason to get a hold of an original poster.