Recently, Arts-Based Research and A/r/tography have become more widely accepted in Japan. Our study aims to clarify phases of independent inquiry in an art class called “Millor Art,” with the participation of a student with intellectual disability. We expanded upon the student’s inquiry process using the A/r/tography approach. We observed the student using Millors and colored cellophane sheets to create imaginative works while performing inquiry-based processes. The subject’s activities indicated that there were two additional phases of her inquiry: “Symbolic Play” and “Interaction.” Furthermore, we determined that both Millors and computer recording deepened her capacity for reflection.