Over the sum­mer of 2014, Lon­don’s South­bank Cen­tre held a Fes­ti­val of Love, exhibit­ing pieces of hip­py iconog­ra­phy which remained dot­ted around the com­plex long after the event. They cre­at­ed a suit­ably fit­ting por­tal to one par­tic­u­lar event: an evening of psy­che­del­ic films at the BFI called Flower Chil­dren in the Blind­ing Light: the 60s…