Kelly Dobson, an artist, invented a blender that responds to sounds. She took an old blender from the 1950s and retrofitted it so that you could turn the machine on and make it go various speeds depending on the tone and volume of your voice. This interactive blender is called Blendie.According to the website (where you can see Blendie in action), "The participant empathizes with Blendie and in this new approach to a domestic appliance, a conscious and personally meaningful relationship is facilitated."
You'll understand this better if you actually check Blendie out.
