Insanely Fun DIY Science Experiments at Home with Physics Girl

The trick with using the laser to draw shapes reminds me of Jerobeem Fenderson's oscilloscope music (https://www.youtube.com/watch?v=XziuEdpVUe0).  Basically, he makes music that embeds particular tones which, when viewed on an oscilloscope in XY mode, draw an animation to accompany the music.  I suppose that if you played that with the laser on the speaker, the laser would trace out a set of vibrations that match the electrical oscillations measured by the oscilloscope, therefore drawing roughly the same shape (ignoring scaling factors, and the impedance of the laser-on-speaker).