These beautiful lights automatically turn on at night and off at dawn, and have four color options to match your mood.

We may receive a commission on purchases made from links. Imagine how convenient it would be to enter the shower and your bathroom lights automatically turn on. Or going to bed with the dim warm light ...

Color-changing mood rings, forehead fever strips and car-shade indicators all change hues as they warm and cool, thanks to a phenomenon called thermochromism. On a smaller scale, thermochromism is ...