The concept for this organ was developed at an early stage of the design of the new building for the Conservatoire Superieure in Paris. The known factors were the size and approximate composition of the organ, very classical, the height of the room (nearly 10 metres) and the floor plan, a small square (approx. 10 m x 10 m) with steeply raked seating.

The organ was therefore designed to be seen at close quarters and from both the floor and at high level. Many small pipes were used in the façade, arranged on 2 levels to reflect the interior organisation (in total, 130 pipes in the façade). The slight skew to the room plan was met by creating semi octagonal towers in the corners containing the larger pipes of the 8' montre.

The organ case interprets the classical vocabulary with sharply profiled horizontal fins, which create the cornices. The finish is natural oak, with gilding to articulate the horizontal and vertical joints and the pipe shades and a combination of gilding and red paint to emphasise the "fins".