Home-made sPIrograph Robot

I'm 9 and a homeschooler who loves to create mechanical things. I wanted to make a Spirograph that would work automatically, so I created a platform that rotates and made arms that hold a marker. Then I made a gearbox that rotates both. First, it was powered by me cranking a hand crank, but then I got the idea to add my EV3 to power the whole thing... and voila, I had a home-made s-PI-rograph. I use it to make all kinds of designs. I can change the design my changing the length of the arms.