This is great and thank you for making programming more approachable! I think some of the numbers would benefit from units. For example colours, size, coordina

This is great and thank you for making programming more approachable! I think some of the numbers would benefit from units. For example colours, size, coordinates etc can all be represented by the number 444. Therefore `circle 444` could mean a large circle a grey circle, a centred circle. I had to read the example before I understood the code there is all. Perhaps a prefix x444, y444, c444, w444 would help?