This study describes the experience of research participants during the process of open studio group art therapy, specifically while using an art medium, and the meaning behind the experience. We used the narrative inquiry method, which is for qualitative research, to illustrate a deeper meaning of experience gained from using a medium in the art process. Our open studio group art therapy was conducted from March 2018 to July 2020, once a week for 3 hours. The closed group consisted of nine voluntary research participants in an art psychology counseling center in an undisclosed city. All nine participants were selected as research participants in March 2018 and interviewed in depth. The study consisted of data and verbatim records generated from the interview, along with the participants’ writing and artwork. The experience of the medium within the process was free from restrictions, but it was also a succession of confusion and ambiguity; accepting the medium’s senses absorbed to the body was a painful process. The experience of acknowledging and accepting resistance against the medium influenced research participants to extend their psychological and physical relationship, which led accommodating new things in life. The immersion experience in the medium’s innate characteristics was a constant interactive play between “I” and the “medium”, and, as a result, it was also a gateway to the path to be naturally expressed as images.