From the Japan Trendshop website, a place that sells gizmos and gadgets popular in Tokyo, comes the Leaf Thermometer paper temperature reader. Designed by Hideyuki Kumagai, the life-like leaf changes colour like the seasons depending on the temperature around it.
The exact science behind the color-changing is a mystery but it seems to work! The Leaf comes in two packs of five large leaves or eight smaller ones, meaning you can scatter them around your home or office to tell you the temperature in the most innovative way possible. There is even a little seal on the back so you can attach it to a computer or piece of furniture.