Here is another cool marble machine that puts on a relaxing show as you let it run. This Handmade Motorized Marble Machine by Steven Kozari-Frank measures about 8 x 6 x 5 inches. It has a copper and hardwood construction with an acrylic cover.
This marble machine has a knob that lets you adjust the speed. It runs on 2 x AAA batteries. You can find out more on Steven’s website.