This presentation will focus on an interactive sound art exhibition with lines attached to the walls and on the floor in combination with sensors and electronics. The ambition was to create a platform, which enables new forms of musical interaction (Lind, 2016). The aim of this paper is to investigate instruction and learning - the plans and actions of a composer as well as the actions of children (Engeström, 2016). Bendroth Karlsson (2017) believes that children should have access to cultural activities and places such as museums. By meeting artists children can develop their creativity. According to Folkestad (2015) preschool children are able to improvise and compose. The study uses Engeström (1999) Expansive learning framework. This framework presents sequence of learning actions in an expansive learning cycle. Within a qualitative research paradigm, videotaping of thirty 4-5 year old children in five different groups, and two semi-structured interviews with a composer were used to gather data. Conversations were transcribed and non-verbal participation were interpreted. Ethical guidelines were considered. Written consents were collected from the parents. They were also informed of their right to withdraw from the study. Collected data were anonymised. Preliminary findings indicate that the composer "owns" the decisions regarding the activity. There also changes in the object. Sometimes the children proceed differently from what the composer had planned. Children can be encouraged to explore new and creative uses of lines. This study points to the need to develop cultural and creative activities for children in preschool.