rows contribute two each, adding another six. Ten plus six gives sixteen.
That second method provides a useful check because it does not rely on repeating exactly the same eye movement. If you simply scan the whole image again, it is easy to repeat an earlier omission. Grouping the equal rows asks a different question: how many groups are there, and what does each group contain? Here, both methods lead to the same total.
The empty spaces are part of the puzzle’s visual effect. They separate some balls while allowing
