Introduction to "Afternoon Dream in Alameda Park": "Afternoon Dream in Alameda Park" is Rivera's last mural masterpiece. In this picture with tall trees and colorful balloons in a tropical park in the background, there are not only the scenes that can be seen in ordinary parks such as playing children, resting tourists, pets, etc., but also people arguing, revolting armies, and national flags. Some discordant notes, this is indeed a prosperous dream in the afternoon. Full of the intersection of time, changes in space and the unpredictability of the past and the future. He even inserted his own image into it, appearing as a Mexican boy, wearing an orthodox suit and a flat top hat, revealing his big toad-like face. Standing next to him are Carlo in traditional costumes and the puppet image of Ghost Festival. This arrangement makes this fantasy-filled picture faintly echo the conflict between reality and dreams.