This project was developed out of philosophical concerns rather than systems analysis. Wittgenstein said that the foundations of the language game cannot be part of the language. I reinterpret this comment as dividing mental activity into two algorithms. The foreground includes the language game. The illusive background is more abstract than language. I posit that the foreground includes the language game of Wittgenstein. I also posit that the foreground includes picture or graphic references that are more abstract than language, but not as abstract as the true background. With Wittgenstein the background (foundations) is more action or "doing" oriented. The foreground of pictures and language is more structure oriented.
Heath, Jerome, "The Dual Algorithm" (1998). AMCIS 1998 Proceedings. 57.