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Light

Light - One paper is map-printed. The other one is a cover.
Two papers are sticked together.
Between the two papers, there is paper-like battery and LEDs.
Moreover, two electrodes are exposed on the back of the cover paper.
When you scroll it and put the two electrodes together, the LEDs turns on.
The entire roll-paper becomes the flashlight.

Owen Song
A simple consideration Providence, RI