I have a recurring nightmare where I look down at my harp and the strings look like this!!! However, this is no bad dream - instead it's an amazing video of a Chopin Mazurka played on a 6x6 cross strung chromatic harp by Dutch harpist, Mirjam Rietberg.
To quote from Mirjam's website;
'The 6x6 cross-strung chromatic harp is named this way because it has two rows of strings that cross each other.
One row is tuned in whole notes (6 notes in an octave) from C (c, d, e, f#, g#, a#)
and the other row is also tuned in whole notes but from C# (c#, d#, f, g, a, b) '
Mirjam has a lovely website here which includes info about the chromatic harp, and also more about the FRIENDS OF THE CHROMATIC HARP here
I love the idea of the chromatic harp being used for contemporary music and that she plays jazz on it, rather than exclusively being used to play baroque music.