Meet the Chameleon Mood Scarf: a cool wearable made of up various layers that change in response to mood, light, and temperature. The scarf changes its appearance throughout the day. The black pattern is printed in thermochromic ink and responds to the wearer’s body temperature. The light green pattern is printed in photoluminescent ink, which reacts to light. Finally, the white print uses photochromic ink and reacts to UV light.