A method of associating an object with a sticker placed on a surface is
disclosed. The sticker has coded data encoding a sticker identity. The
sticker also has a region which exposes a position on the surface. The
surface has coded data encoding surface identity and locations on the
surface. The method starts by receiving indicating data from a sensing
device which sensed the sticker and surface coded data respectively. The
indicating data is indicative of the sticker identity, the surface
identity and the position on the surface exposed by the sticker. The
object is also identified, and the object is associated with the sticker
identity, the surface identity, and the position on the surface exposed
by the sticker.