I saw this on Amazon and I got so excited because my kids love chalk...I love chalk and I grew up using the Spirograph for pen and paper so the little kid at heart in me bought it right away.
I am very disappointed in it. The big purple ring is hard to keep still on sidewalk! My designs looked like scribble marks because the chalk would not glide on the sidewalk like it does on paper and pen. Don't waste your money buying this... if it is too hard for a 30 year old to do it then it must be for kids too! I do give the inventor props it is a great idea it just is not working well.