Flying Spaghetti Monster wrote:
I still don't know why projections of dream boxes worked like actual dreamboxes
I figure it's because Leo and his crew are "lucid dreamers" if you can lucid dream then you can control what's going on inside the dream. So, in the dream they can make the dream boxes work because they want them to work.
Simple as that.
As said up thread none of that matters as it was just a backdrop for the real story. The movie says that the dream-based dream boxes work the same way as the ones in the real world, thus, that's the way it works.