. >> francesca castagnacci likes to play with new ideas. here illuminated head gear is a kind of brainstorming. the 28-year-old is working on using lights in everyday wear as well, for example in shoes. she has her feet on the ground and her head in the sky. >> light, the cosmos, satellites, the milky way, the entire universe -- i want to create accessories that lives through their own light, that are active and not passive. >> her luminous shoes are made of leather, silver, and have a hidden battery in their soles. >> the battery lasts for about 10 hours. then you have to rechrage it, -- recharge it, like with a cell phone. >> castagnacci needs the batteries to power the optic fibers woven into the fabric she uses. all those fibers meet at one end, where the l.e.d. fills them with light. an l.e.d. or light-emitting diode is just a few millimeters long. a can transform fabric into a fascinating work of art -- it can transform fabric into a fascinating work of light-art. fashion designers are exploring their potential. one german designer ha