"...okay, the really short version is that that's part of the reason why everything is glass. There's projection equipment pretty much everywhere, but it's all tucked away in the walls and ceiling where nobody'll see it. And then Jarvis does a shitload of math to integrate it all and get a visible hologram. The setup is basically functionally useless without some serious hardware to crunch the numbers, because you can't just project statically if people are going to be walking through it, you have to actually change which focal points you're using as some of them are obscured."