Because of the realistic depiction, the positive on the altar retable De aanbidding van het Lam Gods {the adoration of the lamb of god} in St. Baaf’s cathedral in Gent is the oldest organ in the Netherlands of which we can form an accurate picture.  The instrument, two ‘storeys’ tall and provided with shutters, was painted by the brothers Hubert and Jan van Eyck, and was finished in 1432.  There are indications that the instrument, painted on one of the shutters of the upper section, had been made in the 14th century.  This positive illustrates a phase in the centuries-long development of this organ type, which came to an end in the beginning of the 16th century.  A characteristic of such positives was the asymmetry dictated by the pipe layout.

Since 2017 the Nationaal Orgelmuseum in Elburg has a reconstruction of the positive from the altar.  This was built by Winold van der Putten and Ingrid Noack, using research by Van der Putten, Wim S. Ros, and Koos van de Linde.  Cees van der Poel was involved in the project in the name of the museum.  This article considers this instrument in comparison with other positives, and the reconstruction project.