Tonight, as part of the Conversations at the Edge series at the Gene Siskel Film Center, experimental animator Bruce Bickford will preside over a screening of several of his works, including Prometheus’ Garden (1988). I’m no Bickford expert, but I find his psychedelic transformations appealingly perverse, whether he’s using clay figures or simple pencil drawings; people, objects, animals, and shapes constantly morph into one another with a decidedly sexualized glee.