Here's something of his that's entirely unrelated to marbles, it's a handheld modular synthesizer of his own design with an analogue fretboard that he calls a "

Here's something of his that's entirely unrelated to marbles, it's a handheld modular synthesizer of his own design with an analogue fretboard that he calls a "modulin": https://www.youtube.com/watch?v=QaW5K85UDR0 https://www.youtube.com/watch?v=QaW5K85UDR0