Last year at Comic-Con International, comixology teamed with The Hero Initiative for an event that drew in top industry names to create The Blank Page Project, a massive jam board filled with sketches and signatures, all to benefit the nonprofit organization. One source says the mural is 10 feet by 12 feet, and another says it's 9 feet by 13 feet. Whatever the case, it's big, and it's now up for auction by Heritage Auctions.

Among the contributors to the piece are Tim Bradstreet, Jeffrey Brown, Mark Buckinham, Chris Burnham, Amanda Conner, Colleen Coover, Paul Cornell, Nick Dragotta, Kevin Eastman, Ulisies Farinas, Christos Gage, Sterling Gates, Dave Gibbons, Steven Grant, Lea Hernandez, Phil Jimenez, Denis Kitchen, Ron Marz, Bill Morrison, Jerry Ordway, Jimmy Palmiotti, George Perez, Nate Powell, Norm Rapmund, Stjepan Sejic, Walt Simonson, Bruce Timm, Paul Tobin and Mark Waid.

See the full piece below. Online bidding continues through May 15; the auction will be held May 15-17 in Dallas.

The Blank Page Project from comiXology on Vimeo.