Shi Yuan's Heat-sensitive Wallpaper reacts to changes in temperature. When the radiator is switched on the wallpaper 'blossoms' to reveal a patterned surface.

Although not explicitly described by Yuan as a 'behaviour changing' product, the Heat-sensitive Wallpaper could be instructive in reminding users to turn radiators down.

This case study was sourced from Etre's blog: http://www.etre.com/blog/2007/10/shi_yuan_heat_sensitive_wallpaper/