The organ being played here is like a very thick guitar, but the method of playing the more akin to that of a piano. The Chapman Stick was invented in the early 1970s by jazz guitarist Emmett Chapman, who in 1969 developed a new method of playing with both hands on guitar.

Since you don't have hit the chord with second hand to produce sound, allows musicians to play simultaneously chords or melodies and baselines. This makes it look more like a piano than a guitar. Here we hear Bob Culbertson playing the famous Beatles track 'While My Guitar Gently Weeps' on the Chapman Stick.