There are other layouts, like Janko. Manufacturing pianos is expensive, so these are mostly created as 3d printed overlays by hobbyists. https://en.wikipedia.

There are other layouts, like Janko. Manufacturing pianos is expensive, so these are mostly created as 3d printed overlays by hobbyists. https://en.wikipedia.org/wiki/Jank%C3%B3_keyboard https://en.wikipedia.org/wiki/Jank%C3%B3_keyboard https://www.facebook.com/groups/janko.piano https://www.facebook.com/groups/janko.piano Bill Wesley also has the Array system which is somewhat related, but haven't seen that for piano. https://www.arraymbira.com/the-array-system/ https://www.arraymbira.com/the-array-system/