The Wrap-n-Dry Towel has a hook strip on one side of the towel and a loop strip on the opposite side of the towel. The spacer blocks interlock horizontally and vertically using a means of forming a tongue and groove connection between the spacer blocks and between the framing members. The second conversion circuit includes an analog to digital converter and a decoupler. The system is suitably based on use of a position-coding pattern which defines the imaginary surface and which in parts is applicable on different bases.