Perspective conversion: Observe and think about the same thing or phenomenon from different angles, and gain new understanding. Which of the following best reflects perspective conversion? ['When viewed horizontally, it becomes a peak on the ridge side, with different heights.', 'Mountain heavy waters no doubt, Liu An Hua Ming You Yi Village.', 'Stepping on iron shoes and finding nowhere, no effort is required.', 'The people searched for thousands of Baidus and looked back, but the man was in the middle of the lights.']