What's that, you say - our universe is a figment of our imagination? Not so much. When you hear the world "hologram", you might immediately assume that we're talking about something akin to Princess Leia being projected by R2-D2 in Star Wars. She's there, but only sort of. In a study produced by Vienna University of Technology (TU Wien) this week, mathematical researchers suggest that there's a possibility that our universe is, indeed, a hologram. We might just be living in a 2D space, rather than 3.