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(A): Real obstacle with two hurdles (height 0.4 m, depth 0.3 m). White start and stop boxes projected onto the floor marked the beginning and end of the walking path. The three Kinect v2 sensors are highlighted with shaded boxes. (B): Holographic obstacle with one hurdle (height 0.4 m, depth 0.02 m). (C): Holographic obstacle with two hurdles (height 0.4 m, depth 0.3 m).
