 Williamson imagines that through perceptual experiences and relevant feedback a person has acquired the ability to reliably judge distances in terms of inches, and separately, by the same means, to judge them in terms of centimeters. But she has not yet realized that there is a relationship between distance in inches and distance in centimeters. Then one day she uses her perceptual capacity to judge distances in inches and centimeters “offline” by forming side-by-side visual images of marks nine inches apart and nineteen centimeters apart and sees that D is true: If two marks had been nine inches apart, they would have been at least nineteen centimeters apart. She has never measured how far apart the front and back legs of an ant are, but in a similar way she uses her imagination and sees that A is true: If two marks had been nine inches apart, they would have been further apart than the front and back legs of an ant.