The characters in the film utilised holographic touchscreens to interface with devices. They were able to interact physically with a hologram specific to a device (or one of its components). I thought this was mindblowingly fantastic, and have thought about it since as an ultimate interface.
Can you believe that a person in his kitchen and garage is already toying with this concept, and has demonstrated the ability to physically interact with a hologram to produce an effect? The Heliodisplay is real, and is being prototyped right now.
I cannot wait for the day when I can use (let alone design!!) an interface for a system like this.