I Am The Mighty Jungulator has released 3D Harmonium, a digital update of the victorian Parlour technology of the harmonium.
The course of the point is dictated by 3 pendulums (or in this case, 3 oscilloscopes) on the x, y and the z plane. This means you can plot the relationships between any 3 waveforms, graphs, people, events, trends, etc. Check here for information about Harmonographs.
Visit I Am The Mighty Jungulator for more information and a link to download 3D Harmonium.