To look at differences in drift over different spatial locations we placed the participant’s hand in one of four positions. These positions were located 10 cm apart, on a straight lateral plane across the bottom shelf of the apparatus (perpendicular to the mid-sagittal plane; see Fig. 2c). The positions shoulder out and shoulder in were located 5 cm either side of the shoulder of the hand being used for the illusion (outside and inside, respectively). Visual angles of these positions were 25.73° and 14.56° from straight ahead, in the direction of the shoulder of origin, respectively. The Mid (‘midline’) position was at the body midline (0°). The x-mid (‘cross-midline’) position, was the mirror image of shoulder in, and was located 14.56° from straight ahead, in the direction of the other shoulder (of the arm not being subjected to the illusion).