The laundromat reflection test.
Vera opens the laundromat early enough to see Milo pass the window three times. Each pass involves a different tilt of the goggles. He is examining how the curved glass handles moving reflections; Vera is trying to read the bus timetable behind his hair. Eventually she opens the door and asks which pair won. Milo explains that the goggles remained constant. The pavement was the variable. Vera has started leaving a clean square in the window for his next assessment.


