Flexilight? It is a fine line. This book light is so thin that you just put it in your book and use it as a bookmark. Although it's slim, you can't miss it with these striped, dotted, floral and wordy designs. And why is it called Flexilight? Since it bends forward at any angle, you can position the high-quality LED (and its incredible 8 lumen light) anywhere you want it. Batteries included