“some balls are” is a recurring phrase in World of Goo. It is used as the beginning of the tagline for three levels in the game: Flying Machine, Genetic Sorting Machine, and Second Hand Smoke, which are found in Chapter 1, Chapter 2, and Chapter 3 respectively.
The full taglines follow the same format which is “some balls are [adjective] than other balls.”
The taglines of the levels mentioned above are as follows:
- “some balls are lighter than other balls” — Flying Machine
- “some balls are prettier than other balls” — Genetic Sorting Machine
- “some balls are more flammable than other balls” — Second Hand Smoke