Bodily expression play is play, accompanied by body movements, that happens amid interactions with others. It becomes a site for the deepening of mutual communication, as the children seek to understand the intentions of others while expressing themselves through exchanges of body movements, words, facial expressions, and eye contact. This study aims to explain the characteristics of 3-year-olds and 5-year-olds in terms of their development of bodily expression play through sympathetic interaction. By having children play with a scarf, I observedsympathetic interactions, in which fun is shared, to further expand their relationships. When prompted by one-on-one imitation, response, and synchronization, the 3-year-olds started and developed their play with a nearby partner by sharing in the fun. It became a game of lining up scarves in different colors. I observed them playing by experimenting with the scarves, jumping over them, wearing them, throwing them up in the air, and catching them with their heads and hands. In contrast, 5-year-olds developed their play by varying imitation and synchronization. They found the appropriate sense of distance for and continued their play by cooperating with a partner while assessing the surrounding situation. I observed them expressing themselves by moving the scarves around and wearing them around their waists, heads, and shoulders. Based on my observations, it is suggested that this kind of interaction, which involves the sharing of pleasant emotions in a comfortable relationship, leads to the development of play
