What if you could build a mixed reality app once, and run it on all kinds of different VR and AR headsets? Carl and Richard talk to Catherina Diaz about the Mixed Reality Toolkit (MRTK) on GitHub, which offers up a cross-platform deployment of VR/AR applications. Catherine talks about how MRTK abstracts the visualizations and interactions across different devices, including implementations for Hololens, Oculus, Vive, the Windows VR headsets, and even mobile devices! The conversation also dives into how VR and AR evolving, mapping existing user interface metaphors into the 3D realm, and also ideas on what pure VR/AR interfaces could be like!