PAPA BEARS MEDICINE SHOW Retinal Circus Vancouver Concert (1968 Canadian promotional-only 5 x 7 & 1/2 postcard for the July 25 1968 concert at the Retinal Circus Vancouver which featured Papa Bears Medicine Show & Winters Green) The Retinal Circus postcard series was born in the sparkling bayside city of Vancouver in the mid-1960s when the culture was fast becoming shaped by the same psychedelic movement that was brewing in Seattle San Francisco and Los Angeles. In early 196