Spray paint (blue or black)
White paint pen
Embroidery thread the same color as your spray paint
Sticker paper (or paper and glue)
Simon’s book has a matrix in the back showing the order of the planets in our solar system as they orbit the sun. It shows the relative size and color of the planets.
Each of these circles represented the planets’ orbits. (There is no circle for Neptune, as that planet’s orbit would be the outer rim of our needlework circle.)
When they were all attached, I printed a page of labels on sticker paper, cut each, and he attached them next to the respective planet (or the sun).