Mixed Reality allows its users to add a digital content which takes place in their reality. Hololens transforms the environment by putting believable and space-aware holograms in it. We received a few weeks ago two Hololens and I had three R&D days to experiment with those devices. Lately, our team moved to a new office with a room to test our experiences in-house. For a first trial, I decided to work on space extension. The Idea was to enhance the space of the room by putting virtual rooms starting when walls end.