DRM Chair by Thibault Brevet
The Digital Rights Management chair demonstrates what is happening in modern digital times if you buy media. You’re only entitled to use what you have bought in limited ways. Too much use destroys what you have bought. As Thibault says:
The DRM Chair has only a limited number of use before it self-destructs. The number of use was set to 8, so everyone could sit down and enjoy a single time the chair.
A small sensor detects when someone sits and decrements a counter. Every time someone sits up, the chair knocks a number of time to signal how many uses are left. When reaching zero, the self-destruct system is turned on and the structural joints of the chair are melted.