Gilbert Hernandez's quartet of 2013 graphic novels 'The Children of Palomar,' 'Marble Season,' 'Julio's Day' and 'Maria M.' offer glimpses of a richly constructed world.Gilbert Hernandez's quartet of 2013 graphic novels 'The Children of Palomar,' 'Marble Season,' 'Julio's Day' and 'Maria M.' offer glimpses of a richly constructed world.