All you need to add is a battery.
Kyouei Design’s Bookmark Light will turn into an ultra-compact reading light.
Available from Designboom’s online shop for just $16, the flexible bookmark is covered in a simple circuit made from conductive ink, as well as a set of ultra-thin LEDs. When folded over a standard CR2032 watch-sized battery, the LEDs glow, letting you read well into the night.
The LED emits light when the lithium coin battery CR2032 is used for this bookmark. A circuit is printed by the ink in which the silver of a nano sized particle is included on the special film used for liquid crystal.