Sum: Forty Tales from the Afterlives message of the book is the importance of exploring new ideas beyond the ones that have been traditionally passed down. The title word "Sum" refers to the Latin for "I am," as in "Cogito ergo sum". Like Italo Calvino's "Invisible Cities", "Sum" does not fit entirely into the traditional category of a novel. "Sum" has been called "philosofiction", an "experimental novel", and "a collection of thought experiments". Most of the stories are understood to "posit the afterlife as mirroring life on Earth" The New York Times Book Review called Sum a "delightful, thought-provoking little collection [which] belongs to that category
Ergo Proxy two DVD box collection on September 25, 2012 and August 22, 2012 respectively. In Australia and New Zealand, the "Ergo Proxy" DVDs were distributed by Madman Entertainment, the first volume released in March 2007. The first volume of "Ergo Proxy" was released in the UK by MVM Films on August 6, 2007. The English dub of "Ergo Proxy" aired on ABC2 (the national digital public television channel) from July 3, 2007 to December 4, 2007. In Canada, the English dub aired as part of Anime Current, an Anime Television block, on pay-TV digital channel G4 Canada from July 26, 2007