Form follows function in this flexible and transparent combination bookmark and nighttime reading light, which turns on when you fold the battery back to connect with a lower tab.

The ‘bookmark light’ by Kouichi Okamoto “uses a conductive ink that transmits electricity through the help of a lithium coin battery. The grid utilizes ink with nano size silver particles between a layer of film that forms the liquid crystal.”

The transparency provides a fun way to see how the gadget works, and the simple on/off function makes for easy use as a light while the flat configuration makes for a simple bookmark. All in all, a pretty simple but neat way to get a little illumination for your bedroom or travel reading.

The device was created in “collaboration with business venture Agic Inc. of the University of Tokyo – the interactive design can be used as page tab or as a illuminative source, allowing one to carry on reading without disturbing a sleeping partner.”