Wow! Microtonal… 
And I thought playing regular keyboard was hard ? 
I was there just a few years ago for a concert with the OSM.
Being blessed to live just a few kilometers from the Casavant factory, I spent most every Sunday of my childhood listening to one at the local church and of course at Xmas at La Messe de Minuit, where there was always a guest player. Not one like Basilique, a littlier one 
Back when I was a practicing Catholic, the organist at my church was the same one that played organ in Brewer’s Stadium. His playing was the best part of the service. 
Certainly is a complicated Fokker, isn’t it? One might call it a mind-Fokker. 
I WANT TO PLAY IT, NOW!!!
That particular Fokker organ is 31 tone equal temperament if I recall correctly. The keyboard layout was designed by R.H.M. Bosanquet back in 1850. I’ve built a few instruments back in the 80’s based on this same design.
Alas, it never took the world by storm and we still have 12 tone equal temperament as the default choice for most Western music.
Stephen
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Not a traditional type of pipe organ but certainly the biggest and most awesome.
The stalactites are the “pipes”.
Wow!
Personally I would have chosen the stalagmites instead of stalactites, though. Less risk of one falling down due to heavy sound vibrations…
Being anchored to the ground would certainly be safer but I don’t recall hearing of any accidents with its current configuration. In any case I think the sonic qualities from hanging objects is superior to those mounted in the floor (at least with rocks and caves).