Earlier this summer, when I visited at the Jaeger & Brommer organ
factory in Waldkirch, Germany, I photographed a cute and very colorful
little 20-key crank organ.  Orgelbaumeiser Wolfgang Brommer explained:

"It's a 20-note chest organ (belly-organ) and it plays the standard
20-note paper roll music.  The case is built of thick transparent
acrylic plastic sheet [like Lucite or Plexiglas, thickness circa 6 mm]
so that you can see everything and how it works.  All the pieces of the
organ inside are built in the traditional fashion, with solid wood and
genuine leather."

The organ pipes and parts are painted in several bright colors.
I asked, "What do children say when they see it?"

"Oh, they really like it very, very much, because they can see the
pump and the music roll moving inside and hear the lovely sound.

"We have orders now to build several more instruments for museums,
to show to the visitors and school children.  We have had great fun
and success with this product."

Robbie Rhodes

 [ See the see-through belly organ ("die durchgucken Bauchorgel")
 [ at the MMD Pictures site,  http://mmd.foxtail.com/Pictures/
 [ and visit Jaeger und Brommer Meisterwerkstatt at
 [ http://home.t-online.de/home/jaegerbrommer/   -- Robbie