The late Arthur C. Clarke's third law states that "any sufficiently advanced technology is indistinguishable from magic". Past science fiction films have depicted "fictional" ("magical") technologies that became present reality. For example, the Personal Access Display Device from "Star Trek" was a precursor of smartphones and tablet computers. Gesture recognition in the movie "Minority Report" is part of current game consoles. Human-level artificial intelligence is also fast approaching with the advent of smartphone A.I. while a working cloaking device / material is the main goal of stealth technology. Autonomous cars (e.g. KITT from the "Knight Rider" series) and quantum computers, like in the movie "Stealth" and "Transcendence", also will be available eventually. Furthermore, although Clarke's laws do not classify "sufficiently advanced" technologies, the Kardashev scale measures a civilization's level of technological advancement into types. Due to its exponential nature, sci-fi civilizations usually only attain Type I (harnessing all the energy attainable from a single planet), and strictly speaking often not even that.