Toy building set provided with elements that can sense bar codes

Claim 1

A toy building set with elements featuring projections on one surface engageable with apertures on a surface of another element and including at least one detection element for providing positional information by detection of reflected energy, such as light, said detection elements including at least one of said projections on one surface and said apertures on another surface which provide means for mechanically coupling said detection elements with other elements belonging to the building set, a power input means for driving an energy radiating source of a detection element and a signal output means as a conduit for a signal from an energy receiving detector of a detection element; energy reflecting means; and, means for operatively coupling said at least one detection element with said energy reflecting means characterized in that the energy reflecting means comprises code elements provided with at least one of said projections and apertures for interconnection with other elements of the system and also provided with a pre-selected code 20 for interchangeable operative coupling of the energy radiating source and the energy receiving detector to thereby result in changes to signals produced by said signal output means.