When we make films - even 2D films - you're always trying to create this illusion of 3D, anyway. You're trying to create a believable world with characters walking, in and out of the perspective, to create the illusion that there's a world. The desire and drive to create this illusion of three-dimensional space is something that is true about every kind of film because you want the audience to really be experiencing it, first hand. It's a natural extension of the storytelling and the process of filmmaking.