Submissions for the Experimental Gameplay Workshop at GDC 2014 are now open and will remain so until Saturday, Feb. 1, 2014, according to a post on the event's official site.
Organizers are looking for "interesting approaches to interactivity that haven't been tried before," a definition they admit is "unavoidably vague." As examples, they cite "generative games" like Flow and Spelunky, the "innovative user interfaces" of the Guitar Hero series and the "novel multiplayer interactions" of Journey.
Several notable games have made their debut at the annual Experimental Gameplay Workshop, including Braid, Flow, Katamari Damacy, Portal and World of Goo. It will take place during GDC 2014, which will run from March 17-21, and Polygon will be there to bring you all the news.