Twilight levitates the pencil to her side of the table, then starts making a diagram in the corner. “We might be able to remove all the position sensors if we just have the spell report back the distance between two points. If we set those as the base of each finger and the tip, the distance is related primarily by the angle of the big knuckle for the majority of the range, and the second knuckle for the final third, with how you expect it to normally be used. That might be enough, and we could combine a couple sensors.”