Even if you don't listen to electronic dance/house music, you likely have heard of deadmau5; he's the one that wears the huge, electronic mouse helmet when performing. Regarding the helmet:
[It weighs over 30 pounds(!), and] there's a camera up front that shows a view of what's going on outside, since the entire helmet is completely solid and there aren't any eye holes. There's a set of color video goggles on the inside that displays whatever the camera sees, so all interaction with knobs and sliders has to be dealt with in a different perspective. Essentially, he appears to be looking straight outward, but sees what's going on below him.