In 1991 or 1992 Manuel Stoffers - who was then my collegue at the Open university in Heerlen, The Netherlands - brought the Logica Memorativa of Thomas Murner to my attention and later the work of Yates and Carruthers on the history of memory technique. At first after hearing that with the Logica Memorativa a game of cards was involved I expected every card to state a proposition and the rules of the game to be as follows: On every card is one proposition pictured; the cards are dealt; first player trows one card, the minor; second player throws a second, the major; third player the third, the conclusion; the forth player states the figure and the modality of the resulting syllogiosm. I in short expected a training tool. The book proved a very different, less modern strategy since every card was designed to represent a part of the Logic of Petrus Hispanus. The work of Yates added several variants of the Murner approach and a lot of background information. At that time my main interest was with thinking about computers by comparing the introduction of the printing press with the introduction of the computer. It was much later, by the end of the 1990-ies, that I started to search for a tool with which it would be possible to visualize Peircean sign-theory.