Materials
9 (9, 10, 10) x 50 grams of main colour (grey) and,
3 (3, 3, 4) x 50 grams of contrast colour (red) and,
2 (3, 3, 4) x 50 grams of contrast colour (blue) and,
1 (1, 1, 2) x 50 grams each of contrast colours (brown) and white.