Practice question · Numerical answer
A row of 12 evenly spaced dots has the gap after every third dot doubled. How many groups does proximity produce?
Hints
- Grouping follows the smaller gaps.
- Twelve dots, three to a group.
Show the answer
4
Why
Four. Nothing changed about the dots, only the spaces between them, and yet the row is now four objects rather than twelve. That is the cheapest demonstration in the subject that grouping is contributed by the viewer, and the reason an accidental gap in a composition creates an object nobody painted.
Practise The Principles of Visual Perception
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