Wes Wilson described his graphic design aesthetic as "visual poetry set into poster formats." Wilson worked primarily in bold colours, to complement the psychedelic light shows which took place during performances at the Fillmore Auditorium and its rival the Avalon Ballroom. His eye-catching posters feature inventive lettering - which became increasingly stylised and illegible as his style evolved. Wilson began designing posters for Bill Graham's Fillmore venue from its opening in 1966, but soon designed exclusively for the Fillmore. The collaboration was relatively short-lived, ending acrimoniously in 1967 (with the exception of two additional posters he created in December 1968).