The concept of a brain-computer interface headset that allowed you to record, play back, and/or simulate a human being’s entire sensory experience had appeared in a bunch of Halliday’s favorite sci-fi novels, TV shows, and movies. There was SimStim—the fictional Simulated Stimulation technology William Gibson had envisioned in Neuromancer. And a similar form of experience-recording technology had also been featured in Brainstorm and Strange Days, two of Halliday’s favorite films…
