In Chinese calligraphy one must hold the brush straight up, perpendicular to the drawing surface. We had to explain this to each viewer. In further iterations, we would like to have the mounted camera recognize and correct when the user exhibits improper hand position. We had to work with the physicality of how the inked brush reacted on the paper verses the way in which we expected it to. We wanted people to put more pressure when the animation became thicker but they would often instead just do multiple strokes.