You can make an affordable sound visualizer out of a tea cup, used speaker, led light and duct tape. Attach the tea cup to the speaker, add some water, drop a s

You can make an affordable sound visualizer out of a tea cup, used speaker, led light and duct tape. Attach the tea cup to the speaker, add some water, drop a submersible led light and turn on the speaker. The vibration will produce patterns on the water that will refract the light onto the ceiling. With a decent quality setup, you'll see a mesmerizing quality projection of a 3d shape. This trick is used by dolphins to encode visuals in sound, and I've seen a speculation that thoughts in your imagination have the same nature.