I created the Spiral Crystal Light-Up Pop Up Card for the prompt “reverse” in Chibitronics’ #LightUpPoptober project in 2024. The basic mechanical design of the card is based on a piece by Masahiro Chatani. This uses an LED Circuit Sticker, conductive thread, conductive fabric tape, and custom-cut copper traces for the circuit.
Seven minute narrated tutorial/construction walk-through video: