This video is an original composition and performance by Steven Maupin using the gorgeous Rainboard – a DIY dynamic isomorphic keyboard:
An isomorphic keyboard is a musical device where a grid of notes is displayed to the user and the interval change between notes in constant for any given direction. The end result is the ability to move a musical passage between keys without learning a new fingering or spatial relation (transpositional invariance). What this means is that once you have learned a pattern, say a chord or a scale, that pattern is the same for all keys.
The Rainboard can interface the Musix iOS app in order to change layouts and adjust settings. As well, it can be played on its own after a layout is set.
The Rainboard is currently under development. See the Rainboard site for details.