Balance rules this poster, not only in the geometry of the rectangles but in the ying-yang symbol solemnly presented by Wilson's maiden. All roads converge on, or perhaps emanate from, the all-seeing eye, and Moby Grape was in its heyday.
The postcard was printed after the concert with the 2nd printing of the poster, and it displays the same light green olive background. There is some variation within the run in terms of color and size, but all postcards are considered 2nd printings. It is backed with a "West Coast Lithograph Co., San Francisco" credit and measures 4 7/16" x 7 7/16".
When the Avalon Ballroom and Bill Graham's Fillmore Auditorium began to hold weekly dance concerts, Wilson was called upon to design the posters. He created psychedelic posters from February 1966 to May 1967, when disputes over money severed his connection with Graham. Wilson pioneered the psychedelic rock poster. Intended for a particular audience, "one that was tuned in to the psychedelic experience," his art, and especially the exaggerated freehand lettering, emerged from Wilson's own involvement with that experience and the psychedelic art of light shows.