Composed in 1939, this passage is still unique in organ literature. Hundreds of hours of practising and then it's gone in one minute.
Here it can be seen that the fingers remained "glued" to the keys, as it were. This has been composed in 1939 and is incredibly modern for that age. There is no parallel with Schoenberg, Strawinsky, Bartok, or any other composer so far as I know.