REGION HAVING CODED DATA, METHOD OF APPLYING CODED DATA THERETO AND SYSTEM FOR INTERACTING THEREWITH

A region having coded data thereon, a method of applying the coded data to the region and a system having a computer system and sensing device for interacting with the region are provided. At least some of the coded data has data indicative of a functional attribute of a part of the region and the coded data has a plurality of substantially undifferentiated marks positioned relative to a set of predetermined nominal mark positions. Each mark has a minimum radius and a maximum radius, where the length of a mark's minimum radius is greater than 40% of the length of that mark's maximum radius.