MacNeil says that making the people invisible lets her concentrate on things in The swimmers she might otherwise not have noticed.
What do you think you have noticed because the people are not there? Think about such things as:
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lines, shapes, colours and patterns
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ripples, splashes and shadows.
The built wall of the pool makes a line across the work. What things are different on the ocean side of the wall to those on the pool side of the wall?