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samchillian
http://www.youtube.com/watch?v=DbOIBIwg_E4&feature=youtu.be

Keys do not play fixed notes but instead relative distances between notes.

This is a very nice idea! Together with three to four reset keys which set back the pitch to fixed octaves this could be quite interesting!

Perhaps one could sacrifice one key per 8-keys group that always gets the same retuning-offset as the key pressed before.
That way you could use this "clone key" for alternating fingerings to make it easier to play scales with many equal intervals (that would otherwise be played with mostly one finger) faster.