R. Smith. Experiences with the Alternate Reality Kit, an Example of the Tension Between Literalism and Magic. In Proceedings of the CHI + GI Conference, Toronto (April 1987), pp 61-67.
http://portal.acm.org/citation.cfm?id=30861&dl=ACM&coll=portal
Depite the somewhat pretentious title, this is a description of a GraphicalProgrammingLanguage.
Calling it a GraphicalProgrammingLanguage is pretty reductionist, really.