Wicki-Hayden organizes notes vertically instead of horizontally, allowing for several advantages. You get a lot more repeating notes across the board, for one. But on Lumatone, this means you also get a lot of new ways to use the diagonal axis (thank you hexagons!) to easily play different intervals. Whole tones, fifths, minor thirds, fourths, and octaves are all represented by different diagonals. It's a spectacular and inspiring new way to think about making melodies and forming chords.