In her first music box demonstrations, the mathemusician twists paper into a Möbius strip and plays an arrangement. A Möbius strip is a non-orientable surface with only one side and one boundary component.
In her second arrangement, Vi gets cranking with four music boxes. Three boxes create a canon by playing the same strip of paper in sequence, while another plays a loop of paper.
Special thanks to Vi for sharing her creativity! Please visit Vi Hart-Music Boxes to read her original post and find links to more great demonstrations.