The purpose of this study is to examine the learning process that kindergarten children undergo during “Play Activities” in art classes. To this end, we conducted a workshop titled “White Castle Made by Paper” for a group of 40 four-year olds at Mihara Kindergarten, which is affiliated with Hiroshima University. Based on an analysis of the children’s workshop activities, which included folding and stacking sheets of paper cut into four different sizes, it was possible to classify development of the artwork into 10 distinct patterns.