Basically, it’s often as if we’re playing on a theatre stage where every prop is painted on a canvas behind us instead of being actual objects. Sure, they have a certain volume to them, we can see a chair and walk around it, we can sometimes jump up on it, but we can’t interact with it, pick it up and throw it towards another corner. While using a chair as an example may be stretching things here, it’s still an obvious item that some developers sometimes overlook. How many times have I walked through furniture! How immersive is that?