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On the floor, directly underneath my suspended haptic chair, was my Okagami Runaround omnidirectional treadmill. (“ No matter where you go, there you are” was the manufacturer’s slogan.) The treadmill was about two meters square and six centimeters thick. When it was activated, I could run at top speed in any direction and never reach the edge of the platform. If I changed direction, the treadmill would sense it, and its rolling surface would change direction to match me, always keeping my body near the center of its platform. This model was also equipped with built-in...