Marbles (as in "she's lost her marbles") is the latest widely heralded "graphic memoir" release from a major publisher, in this case, the Gotham Books imprint of Penguin.  Maus, Persepolis, Fun Home:  these are but the most widely known of among countless others in this quite successful publishing category.   There's something about comics that allows an up close and personal communion unequaled by other forms and that makes it perhaps the ideal medium for confessional tales, as first revealed back in 1972 by Justin Green with his Binky Brown Meets the Holy Virgin Mary.  As the title suggests, this work focuses on Forney's grappling with a diagnosis of bipolar disorder.  No stranger to the graphic memoir, Forney has been a published cartoonist for fifteen years, and and can count among her works the zesty and zany look at her 1970s childhood, Monkey Food.  In its focus on psychiatry, coming out and coping, Marbles is a satisfying read and might be a good suggestion for anyone looking to follow up Alison Bechdel's latest, Are You My Mother?, which occupies a similar terrain, albeit on very different terms.