If you don’t know the name, you know the line. That is to say, you’ve surely seen the effortless drawing style of Tomi Ungerer—prolific children’s-book author of the 1950s and ’60s—whose life gets an enlightening treatment in this documentary. It doesn’t venture into the dark recesses of Crumb-land, but Ungerer has a story and a career outside the normal job description for “children’s-book author.” Far enough outside, in fact, to be exiled from that world for almost 30 years.