Electroluminescent wire (EL wire) is popular on the Playa for both safety and decorative reasons.
You need to light yourself up to avoid getting run over by a bike or vehicle, or colliding with another person. EL wire is a good way to be seen.
Its decorative properties make it an amazing medium to work with.
In this tutorial, Janet Hansen shows how to add EL wire to an existing costume piece. Visit her website, Enlightened.com, for more information about using electronic lighting on costumes and to see some of her stunning creations.