This flat-packed light by Nendo is made from a single piece of conductive paper, which can be rolled up to create a handheld torch in emergency situations.
The Paper Torch was designed by the Japanese studio alongside circuit manufacturer AgIC and paper company Takeo.

It's made from a type of synthetic paper called Yupo, which has been printed with a checkerboard pattern in a conductive ink made up of silver particles to form a circuit board.

"After testing various types of paper, we selected Yupo paper by Takeo, which is used in the ballot paper for elections," said Nendo.
"With Yupo paper, ink sits evenly and the smooth surface ensures the ink and paper can be rounded with minimal force, and are less likely to curl. The paper is also hardwearing, water resistant and therefore also suitable for industrial applications."
Two buttons ? to switch the light on and off ? were glued onto the circuit board with a conductive adhesive, along with seven small LEDs. The intensity of the light depends on how tightly the paper is rolled.
"The resistance was changed by varying the path length of each LED by adjusting how tight you roll the paper, enabling the lighting to be controlled," explained the studio. "The longer the path the higher the resistance, conversely the shorter the path the lower the resistance."

The LEDs also appear a different colour depending on which way the paper is rolled. If the torch is rolled so the LEDs are uncover...