I second this. The leading edge in HCI is in VR. Imaging the new degrees of freedom from popping menus around in 3-space leads to challenges. What happens to th

I second this. The leading edge in HCI is in VR. Imaging the new degrees of freedom from popping menus around in 3-space leads to challenges. What happens to that menu then when your avatar does a cartwheel across the battlefield. Or, how do you deal with an impenetrable, protective capsule around you character when he/she draws their sword. Is it one-way? How do you even show the capsule? How does the character get their bitcoin through the capsule to gift a poor match girl? There are no VR/HCI books, but that would make an interesting topic.