Substantial challenges remain in developing fiber devices to achieve uniform and customizable photochromic lighting effects using lightweight hardware. A recent publication in Light Science & Application, spearheaded by Prof. Yan-Qing Lu and Prof. Guangming Tao presents a methodical approach to surmount the limitations in photochromic fibers. They integrated controllable photochromic fibers into various wearable devices, providing a promising path for future exploration and advancement in the field of human–machine interaction.