Regardless of how you feel about Valve's Steam Machine and Steam OS, it's tough to argue that the truly innovative (for better or worse) aspect to the Linux gaming initiative isn't the Steam Controller. A traditional gamepad silhouette that replaces analog sticks with touchpads, as well as adds a small touchscreen in the center, is certainly weird. However, a Valve employee is working on even weirder methods of control, in the form of a butt-pad and tongue-mouse.